Ballack feels his old club changed managers too quickly during his time in London.
"In my time at Chelsea I had a few coaches and sometimes they changed them maybe a little too quick but what is surprising is he is a very young coach," says the German.
"When people talk about him they talk most of the time about his age but he showed his quality when even in this young age he won with Porto a European trophy which is unusual.
"It is not surprising that Chelsea had their eye on him always, he worked there before in the background and he did a lot of important stuff for Jose Mourinho. Now he is in a main position as a coach and when he is talking you can see he is totally accepted by the club and the players and that is the most important thing."