He said yesterday that he's leaving Barcelona at the end of the season and is coming to the premier league, i'd take him on a free transfer, i don't think he'll go to Arsenal, Chelsea or Man City, they have plenty of right-backs, my guess is that he's either joining us or Liverpool.
I wouldn't drop Rafael for him. He'll go to City because he's a big name player even though he's long past his best or to a club that actually needs a right back.
He's lost the main asset to his game - his pace. You watch him now and he's a couple of yards slower and that's why he's dipped as a player. In the prem he'd offer very little now imo.