The former forward was full of praise for the goalkeeper after he impressed against Tottenham Hotspur at the weekend.
The Belgian has often come in for criticism at Anfield for some shaky performances, with him famously being dropped by former manager Brendan Rodgers last season.
He returned strongly from that setback, though, and is currently the goalkeeper with the most clean sheets in 2015, and was in fine form against Tottenham on Saturday as he made a number of big saves to keep the scores level at 0-0.
And Aldridge believes that the Reds now boast a keeper with reflexes comparable to the legendary Ray Clemence.
“I think he’s the best shot-stopper Liverpool have had since Ray Clemence,” he wrote in the Liverpool Echo.
“His saves secured us that point against Tottenham, just as they had in the previous game against Everton. That’s two big games where the lad has been our best player, and made brilliant saves.”
The former star is also hoping that Jurgen Klopp can have a positive influence on the Belgian the longer they work together.
The German has taken charge at Anfield following the sacking of Brendan Rodgers, with his influence on the squad having already been noted by both inside and outside the camp.
Many are expecting him to develop the more established players and younger stars at the club, and Aldridge is believes Mignolet can be one of those to benefit most from Klopp’s appointment.
“I think he’ll benefit from Klopp’s presence. He might just simplify his game and give him a bit more confidence,” he added.
“He can have one or two difficult moments with the ball at his feet, but when it comes to making saves, he’s top drawer. I hope people give him a bit of credit for the way he’s playing.”