Louis van Gaal (right) and Jose Mourinho greet before Man Utd face Chelsea this season
That is the view of former Leeds, Manchester City and England right-back Danny Mills, who says the body language of the United players is a big giveaway.
United have lost two of their last four games, including an FA Cup quarter-final defeat to Arsenal last Monday.
And Mills believes Van Gaal, who has steered the Old Trafford club into fourth in the Premier League, will get away with bad performances for one season, but maybe not the next.
Van Gaal clashes with reporters after Arsenal defeat [AMBIENT]
"Louis van Gaal has an exceptional record," Mills told BBC 5 Live.
"It's obvious that he rubs people up in the wrong way, and whether that is a completely happy camp, I would doubt it.
"You can tell by the body language of the players. There seems to be something very unsettled about the United players.
"Van Gaal is getting a lot of stick, but Jose Mourinho finished third last year, and he seemed to get away with it."
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