Manchester United captain Bruno Fernandes was not asking to be substituted towards the end of Sunday's 7-0 humiliation at Liverpool.
The Portuguese has been criticised for his behaviour and attitude in the game.
Ex-United captain Gary Neville questioned the 28-year-old gesturing to the bench when Marcus Rashford was substituted in the 85th minute.
BBC Sport has been told Fernandes was after clarification on his positioning after Antony Elanga replaced Rashford.
Fernandes also appeared to push the referee's assistant in the 81st minute as he tried to get the ball back from Trent Alexander-Arnold on the sidelines.