UEFA is making contingency plans for the "extremely challenging" possibility of a Liverpool vs Rangers Europa League final in Dublin in May.
European football's governing body has reserved the 82,000-capacity Croke Park stadium as a public viewing venue, but is concerned even that might not be enough to accommodate everyone who may come to Dublin without a ticket to soak up the atmosphere for what could be Jurgen Klopp's last game as Liverpool manager.
Clubs with big followings such as Liverpool, Rangers, Roma, AC Milan, West Ham United and Marseille are all still in the competition and all could all be in Friday's quarter-final draw.
The final will be played at the 51,700 capacity Aviva Stadium on 22 May with tickets priced between £80 and £1,700.
If Liverpool and Bayer Leverkusen both make it to the final the game could see Klopp taking on his potential successor Xabi Alonso.
Without naming any clubs, UEFA general secretary Theodore Theodoridis said on Tuesday that the Europa final had already been identified as a possible flashpoint this summer.
"Under certain conditions, because of the potential teams that could qualify, this might end up being the most challenging for us," Theodoridis said.
"We know they will bring a number of supporters without tickets and then there is the issue of potential public viewing venues.
"There are a couple of pairings - I won't speculate on the names but you are clever enough to work it out - that would be extremely challenging to find ways to accommodate everybody that will be present for that game.
"We have already reserved Croke Park as a potential public viewing venue, but that could not be enough.
"We are working on this already, together with the local authorities and also Football
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