Last weekend, Celtic beat Aberdeen 2-1 in the Scottish Cup final to complete a domestic treble, and ever more amazingly, to go through the entire Scottish season undefeated - the first Scottish team to ever do this, and the first in Britain since Preston 1889.
Unfortunately, in Celtic's most successful (domestic) season, there were no Irish internationals on the books forhis historic achievement. This got us thinking in Balls HQ about Irish men who have previously played for the Hoops.
Somewhat surprisingly, only 14 Irish internationals have played for Celtic since 1990 - a random arbitrary year to the start the quiz. We think you should be able to name at least 12 of them, and there's one in particular that will get you a Balls Gold Star.
Before you start though, we have to clear a few things up. The answers only include players who have played with Celtic from 1990 and on-wards. They also have to be full Republic of Ireland internationals, though not necessarily capped during their time at Celtic. And Northern Irish players aren't included either, sorry Neil Lennon.
You have five minutes. Enjoy it, and let us know how you get on in the comments!