As a man who has played for both Arsenal and Barcelona, it seemed natural that West Ham United star Alex Song would be in attendance at the Emirates on Tuesday night.
The Cameroonian was farmed out on loan by the Nou Camp outfit at the start of the season although it looks less than likely that he will be returning to Catalunya at the end of the campaign.
However, it seems as though Song is still an avid supporter of the La Liga outfit and chose to celebrate their 2-0 win with Dani Alves in a very public fashion.
He took some kind of selfie video alongside the Brazilian right-back, showing them in the Emirates away dressing room, laughing and enjoying themselves after a job well done on the pitch.
Arsenal fans have every right to feel a little aggrieved about this. The midfielder spent seven years with the Gunners, coming to the club as an unknown 16-year-old to become a standout player under Arsene Wenger.
Without the Frenchman, it is unlikely anyone would have spotted his talent whilst playing for French outfit Bastia. Needless to say, he has a lot to thank Wenger for. We're not saying Song cannot enjoy himself with his team-mates, but there was little need to make them public.
Song had become something of a star at the Emirates before eventually leaving for Barcelona in 2012. He formed a deadly partnership with Robin van Persie, who himself left in the same summer for Manchester United. In 34 Premier League games in the 2011/12 season, Song conjured an impressive 11 assists.
It was with some surprise, then, that Wenger agreed to sell him to Barcelona for £15m, but it is widely believed the Arsenal boss had a problem with the player on a personal level. Unsurprisingly, he became a bench warmer for the La Liga club and is now attempting to rebuild his reputation with the Hammers.
A return to Arsenal
There is no reason to suggest that he could not one day return to Arsenal. Indeed, many fans were surprised Wenger did not snap him up last summer, such was their need for reinforcements in midfield.
That need was highlighted on Tuesday as Mathieu Flamini was brought on for an exhausted Francis Coquelin only to concede a penalty seconds later. It led to Lionel Messi's second goal of the night and essentially took the tie away from Arsenal.
Had Song been the man introduced from the substitute's bench, perhaps Arsenal would be going to Barcelona with much more of a chance.
Was Arsene Wenger wrong to turn down the chance to sign Alex Song last summer? Give us your thoughts in the comment box below!