The former Fulham boss said on Friday he had been late arriving to that day's media briefing due to flooding at his flat caused by his washing machine, but Spanish media also reported he had been at a nightclub until the early hours of the morning.

Coleman later admitted he had been out late "somewhere I shouldn't have been" on Thursday, and that he had apologised to his players prior to the game.

"There are no excuses from me. It was very late, I've had a lot of people over from England and Wales and I've showed them San Sebastian and I really stayed longer than I should have," Coleman said.

"I don't like making excuses. I apologised to the players before the game, who are the main people, and if I'm honest you with I don't think you (the media) had so much of a problem with me being where I was, I think you were more angry that I was late the next day."

Sociedad's sporting director Salva Iriarte announced that the club will be investigating the incident.

He said: "The president Maria de la Pena and I have met with him .... and we have informed him that we have opened an inquiry."

He added: "The coach has 10 days to answer and then it is the board who will take a decision."