Leinster head coach Leo Cullen has apologised for calling on Celtic fans to turn their back on Glasgow and support his side when they run out at Parkhead on Saturday.
The Dublin outfit will take on Warriors in the grand final of the Guinness PRO14, which is being staged at Celtic Park.
Cullen suggested last week that the Hoops support should back his team because "Glasgow rugby players all support Rangers I've been told".
But he insisted his remarks were not serious as he spoke at his final press conference ahead of their Warriors showdown, saying: "It was a throwaway remark and made in jest. I didn't mean to offend anyone and to anyone I did offend, I apologise."
The Irish side face Warriors in the final with Glasgow looking to win their second title in four years.
The two teams also met in the 2014 final in the RDS in Dublin with Leinster running out 34-12 winners.
More than 40,000 tickets have been sold for Saturday's game, which takes place shortly after the Scottish Cup Final at Hampden.
