Northern Ireland international Jonny Evans has identified himself as one of four West Brom players involved in an incident during a training camp in Spain.
Evans and teammates Gareth Barry, Jake Livermore and Boaz Myhill have issued an apology on the Baggies’ official website.
It comes after reports that members of the squad stole a taxi outside a McDonalds and abandoned it outside their hotel.
Manager Alan Pardew refused to go into detail about the alleged incident, but confirmed a breach of the players’ curfew.
“That is unacceptable and I feel a bit let down by that,” he said.
“There was a curfew on that evening and it was broken, and that is really all I’m going to comment.”
The four players said they identified themselves “out of respect for team-mates who otherwise could be implicated by association”.
Their statement added: "We would like to take this opportunity to apologise to our team-mates, the head coach, the club and especially the supporters for the events which have been the subject of widespread and negative publicity.
“We freely acknowledge and apologise for the break of curfew which we accept represented a breach of the standards of professionalism required of us as representatives of West Bromwich Albion FC.
“The club has informed us that it will now conduct its own inquiry into the incident and we will co-operate fully."