Manchester United quartet Scott McTominay, Bruno Fernandes, Lisandro Martinez and Victor Lindelof were involved in a dressing room bust-up following the 3-1 loss to Brighton & Hove Albion on Saturday, according to the Sun.
The Red Devils skipper confronted the Scotland international, while the Argentine centre-back and his Swedish counterpart also lost it with each other.
Manager Erik ten Hag immediately tried to restore order and will hope his men can respond with an improved performance when they take on Bayern Munich in their Champions League opener on Wednesday.
While the Sun could not present any concrete evidence except to mention the two arguments, players disagreeing with themselves in the dressing room after a poor performance is not unusual in football.
Martinez and Lindelof both put in a calamitous defensive display at the back, and it would have been surprising if they did not talk about it afterwards.
Man United have lost three of their last four games, and the players and manager need to take a long hard look at themselves.
Their defeat to the Seagulls at Old Trafford was embarrassing, and it is safe to say that the team is no longer improving.
The fans booed Ten Hag for the first time at the Theatre of Dreams following the defeat, and the Dutchman has to find a solution as soon as possible if he wants to turn things around.
Man United travel to Turf Moor on Saturday to face struggling Burnley, but how they fare tomorrow could have a huge say on their European campaign this term.
The players need to put up a united front right now, and it will be intriguing to see how they react against Bayern.
