Lampard is in Bangkok with the rest of the squad on their pre-season tour of South East Asia.
He said: "Jose's been brilliant. He's probably even better with all the experience.
"He was such an influence on me and the club before, but he's come back like he's never been gone. He's walked straight back into the building and is held with great affection by people behind the scenes.
"Everyone has fallen straight back into it and after two or three days you could see the intensity, his desire to train and to get the team working to try and win rubs off on everyone."