Callaghan remains a frequent visitor to Anfield and likes what he sees from the Rodgers project.
"I had the privilege of playing for two of the greatest managers football has ever seen in Shanks (Bill Shankly) and Bob (Paisley)," Callaghan told liverpoolfc.com.
"Shanks was without doubt the greatest motivator I've ever known. He had a way with words that was just inspiring. He could make you feel 10 feet tall. Bob, on the other hand, was a fantastic tactician and had an uncanny ability to spot weaknesses in the opposition for us to exploit.
"Shanks and Bob laid down the process of continuity at Anfield which saw men like Joe Fagan and Roy Evans emerge from the Boot Room to become manager, as did former teammates of mine Kenny Dalglish and Graeme Souness.
"I think current manager Brendan Rodgers is trying to rekindle the old spirit of the club in the modern era."