Premier League: Liverpool's Firmino suffers serious hamstring injury, faces lengthy spell on sidelines

Premier League: Liverpool have suffered a big injury blow as their in-form forward Roberto Firmino will be out on the sidelines on a lengthy spell after picking up a serious hamstring injury during their midweek Champions League match against Atletico Madrid.

Liverpool's star forward Roberto Firmino faces a lengthy spell on the sidelines after he picked up a "serious" hamstring injury during their Champions League victory over Atletico Madrid on Wednesday. There is no timeline for Firmino's return and it's a cause for concern, according to Liverpool manager Jurgen Klopp.

The injury could rule Firmino out for a number of matches, starting with Sunday's Premier League trip to West Ham United as second-placed Liverpool look to close a three-point gap on leaders Chelsea.