Carlo Ancelotti believes Chelsea's backline is better than his celebrated defence at AC Milan and is key to winning the Premiership. Ancelotti said: "If you want to win a cup or a championship, it is important not to concede a goal. We have fantastic defenders in Terry, Carvalho and Alex. Chelsea have the best central defenders in the world at the moment.
"Defence is the key. If you don't concede a goal the worst it can be is 0-0. We have four central defenders and nobody has this quality."
