Barcelona routed host Villarreal 5-1 to pick up its sixth straight victory in the competition, but saw captain Ter Stegen leave the match on a stretcher just before halftime after his right knee buckled when he fell awkwardly after going up for a ball crossed into the area.

Barcelona maintained their unbeaten start to the La Liga season with a 5-1 victory over Villarreal but it's a victory that will cause concern for manager Hansi Flick as star keeper Marc-Andre ter Stegen was stretchered off in tears before halftime due to a knee injury.

Barcelona coach Hansi Flick did not want to speculate about the time goalkeeper Marc-Andre ter Stegen could spend on the sidelines but admitted the injury he sustained in their 5-1 win at Villarreal on Sunday was serious.