Your best accountant, developer or sales rep just became a team lead. Nobody taught them how to lead. Here is what the evidence says about that gamble, and how Nigerian employers and recruiters can stop making it.

Last updated: 24 October 2026

It usually begins with good news. A top performer gets promoted on a Monday, the team applauds, and the company congratulates itself for rewarding talent. By the end of the quarter, the same team is quieter, a strong junior has resigned and the new manager is working late to do everyone else’s job. Nothing dramatic happened. A person who had never been taught to manage was simply handed people.

This pattern is so common that it has a name: the accidental manager. This guide looks at what research says about managers who are promoted without training, what the Nigerian evidence adds, and what employers and recruiters can do about it. It is written for hiring managers, HR teams and business owners.

A Few Notes Before We Start

Most of the hard numbers below come from the United Kingdom and from Gallup’s global surveys, because we found no national Nigerian figure for how many managers have been trained. The Nigerian evidence is smaller: a few press features, a survey, academic case studies and consultancy commentary. Several Gallup figures reach us through summaries by third parties, and we flag those. Training is also not a cure-all. It helps most when it comes with realistic workloads, clear expectations and ongoing support.

The Accidental Manager Problem

In 2023, the Chartered Management Institute and YouGov surveyed more than 4,500 UK workers and managers and found that 82 percent of people entering management had received no formal management or leadership training. The CMI also found that nearly half of the managers surveyed, 46 percent, believed promotions often went to people with strong internal relationships and profile, not those with the best ability. That is UK data, but the pattern will be familiar to anyone who has recruited in Lagos, Abuja or Port Harcourt.

Nigerian startups show the same mechanism. A Techpoint Africa feature on accidental managers at Nigerian startups describes how fast-growing companies often hand management duties to people before checking whether they can handle them, as growth forces early hires to lead newer ones. One creative lead in the piece said she was not ready for the step up, and added that she would have preferred to stay hands-on had she been given the choice. The article also points to the Peter Principle, the idea that people are promoted for how well they do their current job, not for the skills the next one needs.

The problem is not limited to startups. A Phillips Consulting analysis argues that rapid promotions, flatter structures and the departure of experienced leaders have left Nigeria with many technically strong but underprepared managers. That is a consultancy’s view, not a measured count, but it matches the Techpoint reporting.

Why It Matters: Managers Shape Everything Around Them

Gallup has long estimated that managers account for about 70 percent of the variance in team engagement. Its State of the Global Workplace 2025 report found global employee engagement at 21 percent in 2024, and blamed the fall mainly on managers: manager engagement dropped from 30 percent to 27 percent while individual contributors stayed flat. A summary of Gallup’s 2026 report, published by Silicon Canals, says global engagement slipped again to 20 percent and manager engagement to 22 percent. That is a secondary source, so confirm the figures with Gallup before quoting them.

The lesson for an employer is simple. If one manager can swing most of a team’s engagement, the quality of that manager is not a soft issue. It is one of the biggest levers you have over output and retention.

The Cost of Leaving Managers Untrained

People leave. The CMI research found that one in three people had left a job because of a negative work culture, and, according to Personnel Today’s coverage, half of workers who described their boss as ineffective planned to quit within a year. Only 27 percent of workers rated their manager as highly effective.

Nigerian evidence points the same way. The Intelpoint and AltSchool Africa survey of more than 2,600 people, run between December 2023 and March 2024, ranked bad leadership as the third most common reason Nigerians leave their jobs, after a better offer elsewhere and lack of career advancement. A smaller 2014 study of 148 staff in Nigerian universities, published by Satope and colleagues, found that leadership behaviour had a high relative influence on staff turnover. It is old and narrow, but it points in the same direction.

Culture suffers. The CMI also found that managers with formal training were significantly more likely to report concerns or wrongdoing than those without. Its chief executive called skilled managers a reputational insurance policy. For an employer, an untrained manager who stays silent about misconduct is a legal and reputational risk, not only a performance issue.

What Training Actually Changes

Gallup reports that only about 44 percent of managers worldwide have received formal training, and that those who have are about half as likely to be actively disengaged. The same summary says managers trained in coaching saw performance gains of 20 to 28 percent and an 18 percent rise in team engagement. These are Gallup figures relayed through a trade publication, and they come from organisations that chose to invest, so treat them as encouraging, not guaranteed.

The benefits are practical:

  • Managers learn to set clear expectations instead of assuming people will guess them.
  • They give feedback early, in private, before small problems become exits.
  • They delegate without dumping, and share workload fairly.
  • They handle conflict and hard conversations, including with former colleagues.
  • They feel less alone, which matters because new managers often burn out first.

There is one limit. A Gallup-based summary by Mindset notes that when a manager spends around 40 percent of their time on administration, no training will fix the problem alone. The job itself has to be redesigned.

Nigerian Realities That Make This Harder

  • Fast promotions. Growth and staff exits mean people are moved up quickly, often with no time to prepare. Techpoint’s reporting shows this is routine in startups.
  • Thin pay and high pressure. Inflation was 15.43 percent in July 2026, so a new manager often takes on more responsibility while still worrying about how far the salary stretches. Stressed managers manage badly.
  • Infrastructure strain. Power cuts, data costs and long commutes affect how teams work, and managers carry the pressure of explaining missed deadlines.
  • Reluctant promotions. Techpoint’s interviewees note that some excellent individual contributors do not want to manage people and would rather deepen their craft.
  • Limited budgets. Many SMEs say training is a luxury. The cost of an untrained manager is just harder to see on a budget line.

What to Train New Managers On

A useful first programme covers a small number of skills well:

  1. Role clarity. What a manager is accountable for, and what they should stop doing themselves.
  2. One-to-ones. A regular, short conversation with each team member about work, workload and growth.
  3. Feedback. How to give praise and correction in plain language, promptly.
  4. Delegation and workload. How to share tasks fairly and avoid overloading the most reliable people.
  5. Conflict and difficult conversations. Including managing people who used to be peers.
  6. Fair hiring and interviewing. Structured questions, consistent scoring and basic awareness of bias.
  7. Policies and ethics. How to report misconduct, handle complaints and protect the company.
  8. Managing yourself. Time, stress and asking for help.

A Practical Plan for Nigerian Employers

  1. Decide who really wants to manage. Offer a technical track so strong specialists are not forced into people roles. Techpoint’s reporting shows what happens when they are.
  2. Train before or at the moment of promotion, not six months later. Even a short programme helps, since Gallup finds basic training has measurable effects.
  3. Use an acting period. Let someone lead on a trial basis with a clear review date before the title is confirmed. Be honest about what the title does and does not include, as we discuss in Job Titles That Sound Impressive but Mean Little.
  4. Pair every new manager with a mentor. A more experienced manager inside or outside the company works well.
  5. Use local providers where they fit. The Nigerian Institute of Management (Chartered), founded in 1961, runs management training for corporate and public bodies, and Lagos Business School offers executive programmes such as its Senior Management Programme. We have not assessed course quality or cost, so compare options and ask for outcomes.
  6. Measure it. Ask each team two or three simple questions every quarter about clarity, fairness and support, and discuss the results with the manager.
  7. Reassign if it does not work. Techpoint notes that moving someone back to a role that suits them is better than dismissal, because they may be a weak manager but a strong employee.
  8. Build successors early. Dependence on a few people is a risk. Our guide to building a talent pipeline from NYSC and university graduates shows how to develop people before vacancies appear.

What Recruiters Can Do

Recruiters sit at the point where a vacancy for a manager becomes a hire, so they can change the outcome.

Frequently Asked Questions

Should every manager be trained? Yes, ideally before they start. Gallup finds even basic training has a measurable effect, and the CMI links training to better behaviour and trust.

Is training enough on its own? No. Managers also need a workload they can handle, clear expectations and support. Training in an overloaded job produces frustrated, better-informed managers.

Do top performers make good managers? Not automatically. Management is a separate skill, and the Peter Principle describes what happens when companies assume otherwise.

How long should manager training take? We found no reliable evidence on an ideal duration. Start with a short core programme, then add coaching and peer groups over the first year.

What does it cost in Nigeria? We found no reliable price benchmark, and costs vary by provider and format. Ask providers for details and for results from past clients.

What if a new manager is still struggling after training? Offer coaching first, then consider moving them to a role that suits their strengths instead of dismissing them.

The Bottom Line

Promoting a good performer into management without preparation is one of the most common and least discussed hiring mistakes. The research is clear that managers shape engagement, the evidence suggests training helps, and the Nigerian signals point the same way even where hard data is thin. Train managers before they manage, give them time and support, and let recruiters raise the question early. If you are hiring, you can post a job on MyJobAlly and describe the support your managers will receive.

This article draws on the Chartered Management Institute and YouGov research, Gallup, Personnel Today, Lab Manager, Silicon Canals, Mindset, Techpoint Africa, Intelpoint and AltSchool Africa, Phillips Consulting, Satope and colleagues, the Nigerian Institute of Management and Lagos Business School, current as of October 2026. Several figures come from surveys cited second-hand and press summaries, and may use different methods. The CMI data covers UK workers and managers, and Gallup’s findings are global, so neither is specific to Nigeria. The Nigerian sources are small, dated or based on consultancy opinion. We found no national Nigerian figure for the share of managers who have received formal training, and no reliable price benchmark for manager training in Nigeria. This article is general information, not HR or legal advice.