Dembele is being linked with Bayern this summer.
"Dembele is a great player," Kovac said at the presentation of Jann-Fiete Arp after also praising Leroy Sane. "He could help us with his qualities, as we have seen with the German national team and Man City."
But Kovac is not ruling out a move for former Borussia Dortmund forward Dembele.
"If Barça finally bring Neymar back from PSG, it could increase the possibility of reaching an agreement for Dembele."