A 27-year-old Invercargill man has died following an alleged assault at a rugby club overnight.

Police were called to an incident at the Marist Old Boys Rugby Football Club in Georgetown, Invercargill, at 11.45pm.

Police say the man was found unresponsive by emergency services and attempts to revive him with CPR were unsuccessful.

Marist club president Bill Dowling said the clubrooms were hired out for a "private function" that had no affiliation with the club.

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The private event was originally intended to have been held elsewhere but that venue had been double booked, Dowling said.

"It could have been anywhere."

Police were speaking to a person in relation to the incident and inquiries were ongoing.