Roberto Martinez has been charged with misconduct by the FA.
The Wigan manager is in trouble over his post-match comments in the wake of this month’s defeat at Manchester United.
Martinez was unhappy with referee Michael Oliver’s decision to award United a first-half penalty after Danny Welbeck tangled with Ali Al Habsi.
And Oliver’s failure to punish a late Welbeck tackle with a red card also annoyed the Spaniard, who said: “I have come to United three times before and for whatever reason we don’t seem to be measured in the same manner as the team at home.
“In many ways, you feel as though you are fighting against a mountain. There were tackles flying around that if they had been the other way round there would have been a couple of red cards.”
Those comments have been interpreted by the FA as an implication of bias, and Martinez faces a fine if he is found guilty.
He has until 4pm on Thursday to respond to the charge.