Manchester United manager Jose Mourinho has ordered a review into the club's medical department due to the number of injuries suffered by his squad, according to reports.
The Times says that the Portuguese coach has not singled out any individual in the medical team, but that he was unhappy with having several players unavailable for key fixtures.
Zlatan Ibrahimovic also has issues with fitness and conditioning work at the club, and reportedly feels that he has lost his match sharpness since leaving Paris Saint-Germain in the summer.
Wayne Rooney, Henrikh Mkhitaryan, Antonio Valencia, Chris Smalling, Luke Shaw, Anthony Martial and Phil Jones have all been sidelined for significant periods of the season.
The report comes days after Mourinho criticised Shaw's decision to pull out of the match against Swansea City because of injury.
The 53-year-old appeared to question Shaw's commitment after the win against Swansea, saying players have to be ready "to do anything" for the team.
He also criticised Smalling for missing the match in South Wales with a foot problem.
Mourinho has clashed with medical staff at former clubs, with the most high-profile incident involving Chelsea team doctor Eva Carneiro at the beginning of the 2015/16 season.
He criticised Carneiro as "impulsive and naive" for treating Eden Hazard late in the 2-2 draw with Swansea, when Chelsea were already down to 10 men following the sending off of Thibaut Courtois.
"There is a difference between the brave, who want to be there at any cost, and the ones for who a little pain can make a difference," Mourinho was quoted as saying by the Daily Mail at the weekend.
"If I were to speak with the many great football people of this team, they will say many times they played without being 100 per cent. For the team you have to do anything. That is my way of seeing.
"We have players with problems. To compete you have to go to the limit. It is cultural for some – and this is my culture. More than me, it is Man United."