Alba departed on 40 minutes after suffering a hamstring injur in his left leg and was replaced by Sergi Roberto at the Westfalenstadion.
First team player Jordi Alba has hurt his left hamstring. Tests tomorrow will reveal the full extent of the injury. pic.twitter.com/MhxRyxPob4— FC Barcelona (@FCBarcelona) September 17, 2019
Back-up left-back Junior Firpo is in Dortmund with Barcelona for the clash but did not make the bench for the game which seems to be why Ernesto Valverde turned to Roberto.
It remains to be seen how serious Alba’s injury is but the team may have to make do without him for Saturday’s trip to Granada in La Liga.