Manchester United fanzine Red Issue has claimed that 'a dressing-room bust-up' occurred following Sunday's 3-0 defeat to Liverpool at Old Trafford.
Steven Gerrard scored two penalties as Brendan Rodgers's side picked up all three points – a result that left United in seventh position in the table.
As it stands, the Premier League champions are 12 points from fourth-place Manchester City, who have two games in hand, and 18 behind current league leaders Chelsea.
United boss David Moyes has come under increasing pressure in recent weeks, but Red Issue have hinted that the Scot's position could soon become untenable following a dressing-room incident at the weekend.