Arsenal will reportedly pocket €4million (£2.8m) should Barcelona win the Champions League.
According to Sport, the Gunners inserted a clause in Thomas Vermaelen's contract ensuring they will receive extra payments based on Barca's success - rather than the player.
The Belgian moved to the Nou Camp in a £15million deal last summer, agreeing a five-year deal with the club.
He is yet to play for the Catalan giants competitively in any competitions, but that will not prevent Arsenal receiving a fee.
Vermaelen has been out of action since suffering a hamstring tear while playing at the World Cup last summer.