Report: Barca defender on Irons radar
The Belgium international joined Barca from Arsenal in 2014 but has made just 11 appearances during a frustrating spell in Catalonia.
Spanish outlet Sport say Barca boss Luis Enrique will allow Vermaelen to leave the Nou Camp this summer and the Irons are reported to be chasing the player.
It is claimed Vermaelen would prefer a return a move to West Ham over Liverpool, although there has not yet been any contact between the Hammers and Barcelona.