Southampton have confirmed they are investigating an incident involving Artur Boruc during Saturday's 2-1 defeat to Tottenham.
The goalkeeper is alleged to have thrown a water bottle into the crowd at St Mary's as well as swearing at supporters after he conceded a second goal.
It had been reported that Saints had already looked at the video evidence and decided that the former Poland international had no case to answer.
However, a club statement read: "Southampton Football Club can confirm that it is investigating allegations of an incident involving Artur Boruc that occurred towards the end of the first half during Sunday's match against Tottenham Hotspur.
"The club takes such allegations extremely seriously and will deal with the matter in the appropriate manner."