He told talkSPORT: "Chelsea are a concern for me.
"The new manager and his new [backroom] team are relatively inexperienced. I worry for Chelsea. I just didn't see any sense in getting rid of the previous manager. I thought Ancelotti was a good manager, tried and tested at the highest level.
"The guy they have got in now is untried. Being successful in Portugal, where I worked for two years, with Porto, isn't the biggest of deals. The way they have got it set up there, from the president down, they are more or less guaranteed success every year there."