Manchester United are concerned that Alexis Sanchez is struggling to settle at the club and fear a repeat of the Angel Di Maria fiasco, Daily Mail reported.
Sanchez, who is preparing with the Chile squad for their internationals against Sweden and Denmark, has a reputation for being single-minded and sullen at times.
However, staff have been surprised by his miserable demeanour at the club's Carrington training ground where he cuts an unhappy, isolated figure and often eats alone in the canteen.
'He looks like someone who doesn't want to be here,' said a United source on Tuesday night.
'The whole thing doesn't seem right and he looks like a lost boy. It was the same with Di Maria.'