The Catalans agreed a €105m deal with German club sign the French international in August 2017, with an additional €40m included in the move based on performance related add ons.
According to reports from Marca, they will now automatically trigger a €5m bonus, if he plays against Abelardo Fernandez’s side.
Barcelona have already paid €25m in bonuses during his three and a half years in Catalonia based on their consistent Champions League qualification.
This next payment refers to the former Rennes winger reaching 25 appearances in a season on four or more occasions in Spanish football, with 23-year old in line for his 100th club appearance against Alaves.
Dembele has returned to the Barcelona starting XI in recent months, after an injury disrupted 2019/20 campaign restricted him to just three La Liga starts.
The remaining €10m will be paid to Dortmund if Barcelona win two Champions League titles during his time at the club.