The Cameroonian midfielder only left the Gunners in 2012 to switch to the reigning La Liga champions, but he has found playing time hard to come by in his two seasons at the Nou Camp.
With just one year left on his current contract, a summer sale looks likely with the Catalans not willing to offer him an extension after a torrid time at the club.
A return to the Premier League has been mooted for some time, and despite interest from Liverpool, Tottenham, Everton and Manchester United, an Arsenal comeback is the 26-year-old’s desired option.
Song cost Barcelona £15m, yet they are rumoured to be willing to take a £5m hit to get him off of their books as they set about a huge summer of transfer activity after seeing a FIFA ban suspended.
Arsene Wenger may well be keen on the deal, with speculation suggesting that he’s eyeing a replacement for veteran midfielder Mikel Arteta.