Manchester City's Jack Grealish was involved in a heated 'discussion' along with Pep Guardiola and Harry Maguire in the tunnel after Man United's 2-1 win in the derby, Jan Aage Fjortoft has reported.
It came after Bruno Fernandes scored a controversial opener that some have argued should have been ruled out, as Marcus Rashford was in an offside position and may have interfered with play.
Manuel Akanji complained to the referee in a heated conversation along with Kyle Walker and Grealish after the game, as they questioned why he had not been asked to check the monitor after such a controversial goal.