The Belgium international left the Gunners to join the Catalan giants back in 2014, but his two-year stint at the Nou Camp has been blighted by injuries.
Vermaelen is understood to have slipped so far down the pecking order at the club that he’s available for transfer this window, and reports claim that West Ham and Arsenal are suitors for him.
Roma are believed to be willing to offer €15m (£12.7m) for the 30-year-old, but their pursuit of Federico Fazio from Spurs may have an impact on their desire to push through a deal.
Vermaelen, although he may not be welcomed by fans, could be a good option for Arsenal given that Per Mertesacker’s injury has left them short of cover.
West Ham meanwhile may be attracted to his ability to fill in at left-back, with Aaron Cresswell set for four months on the sidelines.