West Ham United striker Andy Carroll was sent home from training on Monday following a row with manager David Moyes, sources have told ESPN FC.
Carroll, an unused substitute in the weekend defeat to Manchester City, had a heated argument with Moyes at the club's Rush Green training ground.
The manager wanted to discuss why he had left the bench to go back to the changing rooms before the end of the game.
Moyes said after the game on Sunday that he would "deal with" Carroll and sources have told ESPN FC that views were exchanged and the manager felt he needed to send the former Liverpool striker away from training.
Carroll is expected to be fined the maximum two weeks' wages and it remains to be seen whether he is included in West Ham's plans for their final three games of the season.
The incident casts a further shadow over Carroll's long-term future at West Ham.
The 29-year-old has made only eight starts and 16 appearances in total in all competitions this season and has suffered a number of injury setbacks.
Carroll is entering the final year of his contract and, with Moyes expected to remain in charge next season, West Ham could decide to sell him in the summer rather than risk allowing him to run down his contract.