The La Liga giants signed him from Arsenal few years ago for a fee around £15 million, however the player never got a consistent run of games at Camp Nou and is now keen to return to Premier League on permanent basis.
Song spent last season loan at West Ham Untied, he was a regular player for them. The 27-year-old played 28 games for them in the Premier League last term. He has also been targeted by the Hammers.
West Ham are confident that the loan spell will help them to seal the deal permanently.
The Cameroonian star has still two years left on his Barca contract but the player has no plans to waste his time at the Camp Nou.
Song who reportedly earns £70,000-per-week will have to accept a pay cut if he is eyeing to join West Ham. While joining Man City or even Chelsea would be good for him only considering the contract. He will have to struggle at both the sides for regular time.