Torres & Arbeloa may be fit to face Real
Torres limped out of the first leg, won 1-0 by Liverpool, with an ankle injury and Spanish compatriot Arbeloa has not played since the match in Madrid because of a hamstring injury.
"Fernando is improving but it's still too soon to say if he'll be fit," Benitez told the club's website.
"He is working hard with the physios and we now have two or three more training sessions before we have to make a decision.
"I think he can be close but each player is different. We just have to wait and see. Arbeloa is much the same as Torres and we will try to push him harder over the next couple of days."
Another player hoping to return in Tuesday's home game is defender Daniel Agger, who has had a back problem.
Benitez added: "It will be harder for Agger but he too is working hard with the physios. All three could be close."
Liverpool do not have a match this weekend after being knocked out of the FA Cup by Everton a month ago.
LIVERPOOL FANS! Check FourFourTwo.com’s ever-expanding interviews archive for more stuff to read:
Web Exclusives Ian Rush, Craig Johnston
Q&A Steven Gerrard, Fernando Torres
One on One Michael Owen, Nicolas Anelka, Kevin Keegan
Boy's A Bit Special Danny Guthrie
Ask A Silly Question John Barnes, Peter Crouch, Luis Garcia, John Aldridge
Perfect XI Jamie Carragher
What Happened Next? Julian Dicks
And Another Thing Being a Big Four fan
Plus! Rate Liverpool players (and others) on Talentspotter