Arsenal will receive €4m (£2.8m) if Barcelona win the Champions League due a clause in Thomas Vermalen's transfer, according to reports.
The Belgium defender moved to Barca for £15m last summer, agreeing a five-year deal with the Spanish giants.
According to Sport, the Gunners had inserted a clause in the transfer stipulating that they will receive additional payments based on Barcelona's success.
The 29-year-old, however, is yet to kick a ball for Barcelona. He has been sidelined with a hamstring tear all season, after picking up the injury with Belgium during the World Cup. He was an unused substitute in the Champions League semi-final second leg at the Allianz Arena on Tuesday.
Vermaelen made a total of 150 appearances for the Gunners between 2009 and 2014.
Barca will face Juventus in the final in Berlin on 6 June. Barca overcame Bayern Munich 5-3 on aggregate, while Juve beat Real Madrid 3-2 over the two legs in the semi-final.
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