The Hammers could be in the market for goalkeeping reinforcements should Adrian follow Darren Randolph out of the London Stadium.
Former West Ham United goalkeeper Robert Green
And Green, who spent six years on West Ham's books before leaving the club in 2012, finds his position under threat from new Leeds recruit Felix Wiedwald.
A number of Premier League and Championship clubs have been linked with moves for the 37-year-old already this summer, and two of those, Middlesbrough and Arsenal, are also 4/1 with Bet Victor.
Sunderland remain the favourites for Green's signature at 1-1, but like Middlesbrough - who are Randolph's new employers - the Mackems have recently strengthened their goalkeeping department.
New Sunderland recruit Jason Steele
The Leeds man would likely find himself backing up Joe Hart at West Ham, although his connection with the Hammers could make them a sensible bet.
Should West Ham bring back Leeds' Robert Green?