Wasn't there some Polish keeper at Celtic who beat a few people up once?
The most famous (and possibly only) Polish goalkeeper they've had recently is Artur Boruc - he might have been a bit mental but he didn't beat anyone up as far as I know. He did get himself in a fair bit of trouble for winding up Rangers fans and making religious symbols to do so though.
I heard the Boruc story as he saw a Polish family getting abused in the middle of Glasgow so he leathered the blokes slinging insults.