Can a High-Performing Employee Have a Negative Impact on Their Team?

A high-performing employee might consistently meet their targets, take on additional responsibilities and be viewed by senior management as someone who is doing an excellent job.

On paper, there is little to suggest anything is wrong. However, their colleagues may have a very different experience of working with them. Perhaps the employee regularly oversteps boundaries, dominates discussions, gets involved in matters outside their responsibilities or struggles to recognise when their approach is frustrating others.

For managers, this raises an important question. Can someone be performing well individually while having a negative impact on the wider team? The answer is that individual performance and positive team contribution are not always the same thing.

Does Good Performance Mean Someone Is a Good Team Member?

An employee's performance is often assessed through their objectives, workload, productivity and the quality of their work. However, these measures don't necessarily tell a manager how effectively someone works with their colleagues.

An employee may produce excellent work but regularly interrupt others, disregard professional boundaries or create unnecessary tension through the way they communicate.

These behaviours may not immediately affect their individual results, but they can influence how comfortable and supported other employees feel. Being good at a job involves more than completing tasks. How someone works with others can be just as important to the overall effectiveness of a team.

Why Do Managers Sometimes Overlook the Impact of High-Performing Employees?

Managers can understandably place considerable value on employees who deliver results, show initiative and appear enthusiastic about their work. When someone is consistently meeting expectations, there may be little reason to question whether their approach is causing difficulties elsewhere.

This can be even more pronounced when the employee is confident, proactive or regularly receives positive feedback from senior colleagues. However, the manager's experience of that employee may be quite different from the experience of those working alongside them every day.

Colleagues may feel uncomfortable challenging certain behaviours, particularly if they believe the employee is highly regarded by management. As a result, tensions can develop without anyone raising the concerns.

This is why managers need to understand how their teams are functioning, rather than relying solely on individual performance measures.

What Are the Signs That an Employee Is Affecting Team Morale?

Not every team issue will be brought directly to a manager's attention. Sometimes the signs are more subtle. Employees may become quieter during meetings, avoid working with a particular colleague or appear increasingly frustrated during everyday interactions.

There may be changes in communication, reduced collaboration or a sense that certain team members are withdrawing. However, managers should be careful not to interpret these behaviours as automatic evidence that one employee is responsible.

There may be other explanations, including workload pressures, wider team disagreements or individual circumstances. The important thing is to remain observant, maintain regular conversations with employees and be willing to explore concerns rather than assume everything is fine because work is being completed.

What if the Employee Doesn't Realise Their Behaviour Is Causing Problems?

Not everyone recognises how their behaviour is experienced by others. An employee may believe they are being helpful by getting involved in colleagues' work, enthusiastic by contributing frequently or friendly by taking an interest in people's personal lives.

However, their intentions may not match the impact of their behaviour. Someone who repeatedly offers unsolicited advice, interrupts conversations or becomes overly involved in matters outside their role may genuinely be unaware that colleagues find their approach frustrating. This doesn't necessarily mean the employee is deliberately behaving badly.

Managers should focus on specific behaviours and their impact rather than making assumptions about someone's personality or intentions. Where relevant, they should also consider whether differences in communication, disability or other individual circumstances mean that expectations need to be explained more clearly or reasonable adjustments considered.

Should Managers Intervene if Nobody Has Made a Formal Complaint?

Managers don't need to wait for a grievance or formal complaint before addressing concerns about how employees work together. If a manager becomes aware of behaviour that is affecting working relationships, an early, informal conversation may be appropriate.

This might involve explaining that colleagues need space to manage their own responsibilities, discussing expectations around communication or helping an employee understand when their involvement is not required.

However, managers should avoid acting purely on gossip, personal dislike or assumptions about an employee's intentions.

They need to understand what is happening, identify specific examples where possible and distinguish genuine behavioural concerns from ordinary personality differences. The aim should be to improve working relationships, not to criticise someone for being enthusiastic, confident or sociable.

How Can Managers Balance Individual Performance With Team Behaviour?

Managers should recognise and value good performance while being equally clear that professional behaviour and effective working relationships matter. An employee shouldn't be given a free pass on their behaviour simply because they deliver strong results. Equally, concerns about their approach shouldn't automatically overshadow the positive contribution they make.

Where improvement is needed, managers should explain what needs to change, why it matters and what appropriate behaviour looks like. This might include respecting colleagues' responsibilities, recognising professional boundaries, listening to others or adjusting how they contribute to team discussions.

Regular feedback and follow-up conversations can help ensure that improvements are maintained without unnecessarily escalating the matter into a formal process.

Good Managers Pay Attention to the Whole Team

A team can appear productive while underlying frustrations gradually affect working relationships and morale. Managers who focus exclusively on results risk overlooking these issues until relationships deteriorate or someone raises a formal complaint.

Recognising concerns early and addressing them fairly helps create a working environment where individual achievement and positive team relationships can exist together.

Need HR Support?

BloomHR provides independent HR support to small businesses, helping managers navigate team dynamics, address workplace behaviour and manage difficult employee conversations.

Whether you're dealing with tensions between colleagues or need guidance on improving working relationships, BloomHR can help you take a fair and practical approach. Contact us for more information.