Arsenal are stepping up their revived bid for Swansea City defender Ashley Williams.

The Daily Express says Williams has now become Arsene Wenger's top target as he wants four central defenders in his squad next season.

Thomas Vermaelen faces a lengthy spell on the sidelines after being ruled out of the club's pre-season tour of Asia due to a back injury.

Swansea are anticipating a bid for the Williams, who appears to be keen on a switch to the Emirates.