Probably would at this stage we had Rugby in Croke Park last year and Pairc Ui Chaiimh could do with the few Bob.
I doubt it though GAA grounds aren’t great for Association football, GAA pitches are much bigger then association football pitches.
Here’s when the Irish football team played a few games in Croker, UEFA wouldn’t want that aesthetic.
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Thomand park in Limerick would probably an alternative but that only holds 25k.
The biggest stadiums in the country are all GAA Grounds.