The Czech Republic international was snapped up from Rennes for £7million in the summer and installed immediately as Chelsea's first choice keeper despite the performances of Cudicini in recent seasons.
"That didn't surprise me," said our goalkeeping coach Hans. "I've known about Petr Cech for quite a while and seen him a about six times in the last couple of years.
"He was always seen as one of the best young goalkeepers in Europe and quite well known around the clubs, especially the goalkeeping coaches.
"When I was watching him, quite a few were there as well and eventually Chelsea came in and paid quite a lot of money for him.
"His strength is in his shot stopping. He's magnificent, his one against one is very good.
"But there are one or two things he needs to work on and I'll talk to the manager about them because I believe we can take advantage of them.
"He is a very good goalkeeper but hopefully he'll have a nightmare against us."
Hans Segers is not surprised that Petr Cech has grabbed Carlo Cudicini's number one shirt at Chelsea.