Brighton and Hove Albion say an incident in which excrement was found in the away dressing room may have been an accident rather than a "deliberate act of vandalism".
Earlier this month, Brighton had to formally apologise to Crystal Palace after excrement was found on the floor of the away dressing room ahead of the second leg of the play off final - which Palace went on to win 2-0.
Chief executive Paul Barber announced that they had found "no evidence" to link the dressing room incident to a member of staff but admitted they did not know who was responsible.
“There is no evidence that a member of the club's staff was responsible. Equally, we cannot be sure who was.
"Unfortunately, we are very unlikely to know exactly what happened, but access and security to the tunnel area have been reviewed and some changes will be implemented next season. It is now time to move on," he said in a statement on the club website.