Aldridge has blasted the Spaniard's tactics and transfer policy.
Aldridge said: "This is the lowest point in my lifetime as a Liverpool fan.
"Rafa's departure would be an upheaval but he would've lost his job by now if he was at another top club. The question is - do Liverpool have the money to pay off the remainder of his contract?"
Aldridge, speaking to Nuts magazine, added: "Liverpool must finish in the top four, whatever it takes.
"Anything else would be a disaster for the club already weighed down in debt. Sadly, I can't see any way they'll claim that final Champions League spot - unless they get back on track soon
"Benltez can't claim injuries are the problem, as both [Fernando] Torres and [Steven] Gerrard are now fit and playing.
"However, he’s still employing baffling tactics - such as sending out a defensive team against the Premier League's bottom club and getting beaten."
He added: "Torres and Gerrard need support! Apparently, Real Madrid's Ruud van Nistelrooy fancies coming to Liverpool and I reckon he'd be an excellent short-term option.
"I'd also try to bring in the Celtic's Aiden McGeady and even Bolton's Kevin Davies.
"Robbie Keane, Peter Crouch, Craig Bellamy and Michael Owen could all be wearing Liverpool colours today, yet Rafa relies on an untested kid in David Ngog to start in big games? Now he's reaping the rewards of letting his best players leave."