Jose Mourinho has cautioned derby referee Michael Oliver to watch out for Manchester City players diving at Old Trafford on Sunday.
He has said he is concerned some City players have a tendency to “lose their balance very easily.”
He is not the first Premier League manager to accuse Pep Guardiola’s side.
Sean Dyche claimed Bernardo Silva cheated to win a penalty in October, while Arsene Wenger accused Raheem Sterling of diving to win a penalty against Arsenal last month.
“City are a good team,” said Mourinho.
“They defend well, they react well to the moment they lose the ball. They have a good dynamic in attack, they have creative movement, they have amazing players they have a fantastic coach, they have lots of good things.
“If you ask me one thing that I don’t like a lot is that they lose their balance very easily. A little a bit of wind and they fall.”
United will look to set a new club record of 41 consecutive games unbeaten at home when City visit this weekend.
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