The Reds have been heavily linked with the former Arsenal star for much of the summer, with the Spaniards rumoured to be ready to cut him loose after two woeful seasons at the Camp Nou.
Speculation a couple of weeks ago suggested that a deal was almost done, but talk went quiet at the Merseysiders focused on securing Alberto Moreno and Mario Balotelli to take their signing tally to nine for this window.
But interest in Song from Anfield is not dead, with Brendan Rodgers keen to get the Cameroonian in on loan.
Barca want a permanent sale for around £10m, but Liverpool are looking towards such an agreement next year as long as the midfielder can prove he’s still a top player.
Arsenal have also been linked with a move to draft in their former star, while Marseille are watching.
Song is able to play in a holding midfield role or as a centre-back.