The French defender has found it difficult to settle at Anfield since his loan move from Valencia, and former striker Aldridge reckons that Glen Johnson would be a better fit in the left-back slot.
Aldridge told the Liverpool Echo: "What's clear is that left-back is a real problem area for the manager. I don't want to be too critical but we can all see that Aly Cissokho is really struggling.
"In the short term I'd solve it by playing Glen Johnson on the left and then either Martin Kelly or Flanagan on the right."
The Reds are currently fourth in the Premier League.