Robert Lewandowski and Raphinha struck twice each as Barcelona romped to a 5-1 win at Villarreal on Sunday in a wild match to maintain their perfect start to La Liga. The leaders’ sixth straight league triumph was marred by a potentially serious knee injury to goalkeeper Marc-Andre ter Stegen, who was taken off on a stretcher.

Villarreal drew with Atletico Madrid before beating Sevilla and Celta Vigo for seven points from a possible nine and they have since added four more points to their tally with a draw at Valencia and a win over Mallorca.

Barcelona has extended its perfect start to the Spanish league season but lost goalkeeper Marc-André ter Stegen with a serious knee injury.

Andre ter Stegen for months after he was carried off on a stretcher during Sunday's 5-1 LaLiga win at Villarreal, a source confirmed to ESPN.

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.