Ousmane Dembele has travelled to Finland for surgery on the ruptured tendon in his hamstring that will force him to miss four months.
Barcelona bought Dembele from Dortmund for an initial €105 million.
Dembele was making only his third appearance for Barca, and his first La Liga start, when he pulled up after 25 minutes of Saturday's 2-1 win over Getafe.