West Ham striker Andy Carroll was sent home from training on Monday following an argument with manager David Moyes.
It is understood Moyes spoke to Carroll about his conduct after he left the substitutes’ bench during Sunday’s 4-1 home defeat by Manchester City.
The pair had a heated exchange before Carroll, 29, was told to go home.
After Moyes made a triple substitution during the second half against City, Carroll went to the dressing room and did not return before full-time.
Moyes was known to be irritated at Carroll’s behaviour, believing the former England international should have remained to support his team-mates.
It is not known whether there will be any further disciplinary action, although West Ham’s players are not training on Tuesday as they have been given the day off.
The news comes as the Hammers continue to battle for their Premier League future.