Athletic Bilbao will have to make do without the services of Inaki Williams for Thursday's quarter-final second-leg Europa League clash against Sevilla.

The striker has been sidelined by a hamstring complaint that he suffered during the 1-0 win over Rayo Vallecano at the weekend.

"Inaki Williams has an overload on the back of his left thigh," read a statement on the club's official website.

"His availability will depend on its evolution over the coming days."

Bilbao go into the clash against their La Liga rivals with a 2-1 deficit.