Liverpool striker Fernando Torres [ Images ] will be out of action for up to three weeks with a hamstring strain, the Premier League club said on Thursday.

The Spain international, who was also sidelined for three weeks in October with a similar problem, picked up the injury in Wednesday's 1-0 Champions League [ Images ] victory against French side Olympique Marseille [ Images ] 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 (www.liverpoolfc.tv) after the player underwent a scan.

Torres, who scored Spain's winner in the Euro 2008 [ Images ] 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 [ Images ] on 33 points but with an inferior goal difference ahead of the weekend's programme. They host West Ham United on Monday.