Munster say they have opened an investigation after one of their fans was seen interacting with a Bayonne player during their Champions Cup game on Saturday.
A scuffle broke out between the sides in the 45th minute of the 17 all draw at Thomand Park.
Footage captured by TV cameras showed a fan reaching out to grab the jersey of lock Konstantin Mikautadze.
In a statement to the Irish Times, Munster say they are aware of the incident and they will be taking "appropriate action once the investigation is complete.�
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Tributes have been paid to former Ireland international Syd Millar who has died aged 89.
He featured in nine Lions Tests across three tours, and coached the team to a series victory over South Africa in 1974.
The IRFU called the former Ulster prop a "titan of rugby union".
