Jose Mourinho's comments about the appointment of referee Anthony Taylor for Manchester United's Premier League match at Liverpool on Monday are to be looked at by the Football Association.
United boss Mourinho said it would be "difficult" for Manchester-based Taylor to perform well after the decision to give him the game was criticised.
"Somebody with intention is putting such a pressure on him," said Mourinho.
Managers are not supposed to speak about referees prior to matches.
The FA will want to establish the context of the comments before deciding what action - if any - they wish to take.