Premier League - Liverpool rocked by Torres blow
Liverpool striker Fernando Torres will be out of action for up to three weeks with a hamstring strain.
The Spain international, who was also sidelined for three weeks in October with a similar problem, picked up the injury in the 1-0 Champions League victory against French side Marseille at Anfield.
"Fernando has a strain in his right hamstring and will be out of action for between two and three weeks," a spokesman said on the club website after the player underwent a scan.
Torres, who scored Spain's winner in the Euro 2008 final, is Liverpool's joint top scorer in the league this season with five goals.
The club will also be without Brazilian left back Fabio Aurelio, who suffered a calf strain and is expected to be out for two weeks.
Liverpool are level with Premier League leaders Chelsea on 33 points but with an inferior goal difference ahead of the weekend's programme.
They host West Ham United on Monday.