Lionel Messi does not know if he will return from his current knee injury in time to play for Barcelona in the Clasico at Real Madrid on Nov. 21, his brother Rodrigo has told Spanish radio.

Messi tore a ligament in his left knee early this past weekend.

"[Messi] is an excellent professional and knows what he has to do," Rodrigo Messi said. "Obviously there is pressure in all aspects, but he is just thinking about his recovery. Nothing else. He really does not know [when he will return]. Nobody knows yet. His body will recover in its own time. There is no rush. Obviously he wants to play as quickly as possible, but he will only play when he is ready."

Messi will miss several World Cup qualifiers for Argentina in addition to Barcelona's normal schedule.