West Ham's Argentina international Carlos Tevez is expected to be fined after he left Upton Park following his substitution in their 1-0 win over Sheffield United.
Following new chairman Eggert Magnusson's first game as owner, Tevez faces disciplinary action and will be asked to explain his actions by manager Alan Pardew.
A goal from Hayden Mullins ended up settling the match after Sheffield missed numerous second-half chances and had a stoppage-time goal disallowed.
Pardew said, "He (Tevez) went straight home after the game and I am very disappointed about that. It has only happened to me once before.
"The first time was when I first arrived at West Ham and I fined the player a week's money because I think it is disrespectful to me, my staff and the players.
"I will have to listen to his excuse - I'm sure it is just disappointment but that is no good reason. We don't have that kind of discipline here."
Pardew said that he substituted Tevez because he wanted tall players on the pitch following the hamstring injury to defender Danny Gabbidon, who was carried off on a stretcher.
Pardew added, "I thought he (Tevez) was very good. He wasn't substituted because he was playing poorly. We brought Teddy Sheringham on just to defend set-plays."