Striker Robert Lewandowski has a hamstring injury and could miss Barcelona's game against Real Madrid later this month.

The 37-year-old, who scored for Poland in a 2-0 World Cup qualifying win against Lithuania on Sunday, will not feature in his club's La Liga game against Girona this weekend.

Barcelona then face Olympiakos in the Champions League next Tuesday before taking on Real Madrid in El Clasico at the Bernabeu on 26 October.

Barcelona have not indicated how long Lewandowski is expected to be missing for, but Spanish media have suggested, external it could be about four weeks.

"Robert Lewandowski has suffered a hamstring injury in his left thigh. He will be sidelined, and his recovery time will depend on how the injury progresses," Barcelona said in a statement., external

Lewandowski, who has scored four goals in nine appearances for the La Liga champions this season, joins Raphinha, Gavi, Dani Olmo, Marc-Andre ter Stegen and Joan Garcia on the sidelines.

However, forwards Lamine Yamal and Fermin Lopez have returned to training.