The Premier League club are offering £18 million, with West Ham determined to recoup £20 million if a deal is to be completed. It is unclear whether Swansea will match the demands.
Ayew arrived at West Ham for that exact amount 18 months ago – from Swansea - which is why the Hammers are hoping they can recoup the entire fee if they are to lose the 28-year-old.
It is unusual to see West Ham selling an attacker, given the club's desperation to sign a striker in the window. However, Ayew is not happy at the Olympic Stadium club, and he is hoping that a move can be agreed.