Saints today launched a formal investigation into allegations goalkeeper Artur Boruc threw a water bottle at fans during their home defeat to Tottenham.
The club were also looking into claims the 32-year-old swore at supporters after conceding a second goal on what was his home debut in Sunday's 2-1 Barclays Premier League loss at St Mary's.
Several reports suggested Saints had studied video evidence and decided Boruc had no case to answer but they said in a statement released to Press Association Sport this morning: "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."
Boruc faces severe sanctions if found guilty.
Statements from stewards at Sunday's game have been received and it is understood Saints should have concluded their probe by the end of the week.
Former Celtic and Poland goalkeeper Boruc only joined Saints as a free agent last month after leaving Fiorentina in the summer.
He courted controversy several times during his Celtic career, particularly at Old Firm games due to gestures he made to Rangers fans and his habit of blessing himself before matches.