That is according to The Guardian, with the club said to lack leaders in the dressing room.
The absence of Lisandro Martinez is one that has been lamented by United all season.
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The Red Devils were beaten 4-0 by Crystal Palace in the Premier League on Monday night.
The result means that head coach Erik ten hag is in serious danger of losing his job.
Ten Hag has the FA Cup final against Manchester City to save his skin ahead of the summer.