Officials are examining CCTV footage at Thomond Park after allegations that a banana was thrown on the pitch during a match on Sunday night.
French international player Gael Clichy drew attention to the alleged incident through his Twitter account after a friendly fixture between his club Manchester City and Limerick FC.
It has sparked a furious reaction amongst locals in Limerick.
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Ken McHugh is the International Officer with Sport Against Racism Ireland.
He told Breakfast here on Newstalk it is unclear what steps can be taken now.