Four West Bromwich Albion players have apologised for being involved in an "incident" during the club's mid-winter training trip to Spain.
The Baggies announced on Friday that they have opened an investigation into the matter.
The club say the quartet will be "subject to the full rigours of our internal disciplinary procedures", and that they will make no further comment until their investigation is completed.
Manager Alan Pardew said the players involved broke a curfew that had been imposed on them.
"It wasn't what we wanted. We've gone there to try to get ourselves ready and up for the run-in and this is obviously not ideal," he said.
The players have since identified themselves asJonny Evans, Gareth Barry, Jake Livermore and Boaz Myhill.
In a statement, the players said this this was out of respect to their team-mates "who would otherwise be implicated by association."
The footballers said they would fully co-operate with the inquiry.