Plagued by injury problems since his arrival from Borussia Dortmund two seasons ago, Dembele is again facing five months on the sidelines after undergoing hamstring surgery.
However, the France attacker is determined to prove himself at Barca, with a friend informing L'Equipe: "There is no chance that he will leave in the next summer.
"Ousmane will recover well to be ready for the resumption of the championship. He will not leave as a failure. He wants to succeed in Barcelona at all costs."