Crystal Palace boss Patrick Vieira removed Shaun Derry as a first team coach in a row for overstepping in his role after he was caught repeatedly berating players.
The former Arsenal midfielder confirmed earlier this week Derry was set to step down from his role as Eagles first-team coach but refused to go into details.
However, Sportsmail can reveal that the relationship between Vieira and Derry broke down as far back as October, when Palace suffered a 3-0 defeat to strugglers Everton.
The Frenchman entered the dressing room to find his first-team coach Derry berating the players after their dismal performance at Goodison Park.