One of the worst outcomes for a newly appointed football manager is seeing a key player sidelined soon after arrival. Beyond tactics and results, managers rely on a healthy squad, and medical staff often warn that injury rates can climb after a coaching change.
Physiotherapist Ben Warburton, with experience in football academies and rugby, says the pattern is familiar. Players keen to impress may hide or downplay niggles and push through minor issues, which can develop into more serious injuries. Altered training types and loads are also important: sudden increases in gym work, conditioning or intensity can strain players who aren’t accustomed to that work.
Ben Dinnery, founder of Premier Injuries, points to other common contributors. Incoming staff inherit players whose detailed injury histories they may not fully know. A new manager pushing for immediate results can raise fatigue through extra sessions or intensity. Psychological pressure to perform and secure places can change behavior on and off the pitch. Each of these factors can increase injury risk.
There are striking examples. When Jürgen Klopp arrived at Liverpool in 2015 and moved the team toward high-intensity play, the squad recorded more than 20 separate injuries in his first three months. Critics argued the new regime contributed to hamstring problems, though Klopp and others highlighted fixture congestion and wider circumstances as complicating factors.
Academic research supports a connection between staff turnover and injuries. A UEFA Elite Club Injury Study (2023) asked 14 men’s teams about staff changes and hamstring injuries and found that when managers brought in their own fitness or performance coaches, hamstring injuries rose roughly threefold. A 2020 study of Turkish Super Lig clubs reported that injuries more than doubled in the first two weeks after coaching changes.
Top clubs use GPS and other monitoring tools to measure distance, speed and training load. Warburton warns of two common mistakes: training too lightly during the week so matches become an overload, or training too hard in the week and leaving players fatigued for games. Both imbalances increase injury risk. Hitting the right weekly load balance is essential.
Comparing injury rates across teams is complex. Clubs playing in Europe may face 60-plus fixtures a season, while others play far fewer games. Dinnery stresses the importance of considering injury type, mechanism and burden (time lost), not just counts. Timing matters too: appointments in January or during pre-season often involve new signings from other leagues whose physical readiness for a higher level may be unknown.
Practical advice from medical teams is consistent: avoid sudden, large changes. Warburton recommends screening players in the gym, reviewing recent GPS and performance data, and mapping volumes across key metrics. A cautious approach is to replicate a player’s recent loads for the first month or two before progressively introducing a new programme. There’s no single perfect formula, and clubs continually adapt to balance immediate performance goals with long-term injury prevention.