Erik ten Hag fears burnout could wreck Manchester United's quadruple dream.
United remain the only team in England still capable of winning four trophies this season following Ten Hag's impressive impact since taking charge.
The fallen giants have reached the Carabao Cup final, FA Cup fifth round, Europa League knockout stage and also find themselves in the title race.
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But Ten Hag admits injuries are starting to take their toll in the wake of a demanding season made even harder because of the World Cup in Qatar this winter.
The Dutchman has been without injured stars Anthony Martial, Scott McTominay and Antony in recent weeks, while key midfielder Christian Eriksen will be out until April with a serious ankle problem.
To make matters worse, Brazil sensation Casemiro is currently serving a three match ban and will also miss Sunday's crunch showdown at bitter rivals Leeds.
United find themselves having to play three games a week – and Ten Hag admits the workload placed on his stars – and footballers in general – is too much.
Ten Hag said: "So if you see Christian Eriksen, you can't see that as an impact from a tough season, but definitely it's a tough season. With the World Cup in between and a lot of overload for the players, that's quite clear. That process is already longer term coming on, that the load on the players is too much."
Ten Hag knows he's not the only manager facing such problems, but knows it's a problem he just has to cope with. He added: "It's really down to the individual, how we see it and how we find reasons why things happen.
"But with injuries, if you play top football, you go across limits and injuries will come up, so that's also a normal issue, I would say."
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