Torres will be out of action for two to three weeks with a hamstring strain picked up in the Champions League win over Marseille on Wednesday night.
The Spaniard completed 90 minutes at Anfield but underwent a scan on Thursday and is now set for another spell on the sidelines having only just returned from five weeks out with a similar problem.
Defender Fabio Aurelio will be out for a fortnight after picking up a calf problem in the same game.
A club spokesman told the Reds' official website: "Fernando has a strain in his right hamstring and will be out of action for between two and three weeks. Fabio has a calf strain in his left leg and will be out for two weeks."
Torres' latest setback will be a blow to manager Rafael Benitez, who was hoping the 24-year-old would be able to re-establish the partnership with skipper Steven Gerrard that worked so well last season.