The game, which took place on the field of the Reale Arena stadium in San Sebastian, ended with a score of 4: 1 in favor of the team of Javier Hernandez.
Robert Lewandowski scored a brace for Barcelona (1st, 69th minutes).
Ousmane Dembele (66th) and Ansu Fati (72nd) also scored.
At Real Sociedad, Alexander Isak recorded a goal at his own expense (6th minute).
Earlier it was reported that Lewandowski scored his debut goal for Barcelona in the 46th second of the match against Real Sociedad.