Liverpool are sweating on the fitness of key players Steven Gerrard [ Images ] and Fernando Torres [ Images ] ahead of Tuesday's Champions League [ Images ] encounter away to Marseille [ Images ].

Gerrard managed 22 minutes of Saturday's confidence boosting 2-1 win over Manchester United [ Images ] on his return from a groin operation.

But Spanish international Torres remained on the bench after suffering a hamstring injury against Aston Villa [ Images ] on August 31.

Javier Mascherano [ Images ] is also a doubt after pulling up with a calf problem in Saturday's game.

Liverpool are second in the Premier League and head to France [ Images ] on a high after manager Rafael Benitez saw his team record their first league victory over United in his fifth season in charge.

"Now we will go to Marseille in a good frame of mind," Benitez told reporters after Saturday's win.

"That was our best performance of the season and we now feel we can go into a Champions League in good heart and spirit."

Former European champions Marseille met Liverpool in the group stage last season, winning 1-0 at Anfield before being thrashed 4-0 at home.