Ancelotti told the Daily Star Sunday: "I am a very lucky coach because in my career I have always had fantastic keepers.
"Now I have Petr Cech - and that means in my career I have had four of the most fantastic keepers possible.
"Petr is one of the best keepers in the world and his best quality, when compared with the other keepers, is his consistency.
"He is very professional, with a very strong personality but, at the same time, he is a humble, unselfish man."
"During his time at Chelsea, Petr has been consistently the No.1 keeper in the world," said Lampard.
"He had that horrific injury halfway through his spell here but has come back from that stronger than ever, particularly when you look at his form this season.
"He has been brilliant and we are so lucky to have such a top keeper who is so consistent.
"A lot of top clubs have chopped and changed keepers. But Petr has been one constant in our team through all the success."