There are no "banned" songs in a court of law (the only court that matters). The only 'body' who can "ban" a song are the owners of the stadium you have paid entrance to, Rangers for example, and if they so wished they could "punish" you for contravention of the "ban" by banning you! That's about the length of it. UEFA could in theory "ban" a song and impose sanctions, doubt they would though.
The other more pertinent question is whether singing the song, in all its guises, falls foul of OBFA, that's still heavily up for debate.