Chelsea boss Antonio Conte admits their back three system was key to last season's success.
Although Chelsea romped to the title, he has been painstakingly looking back in detail.
Conte said: “It's normal after a season to understand which were the positive things and negative things and which are the situations you need to improve to make your team stronger.
“One positive was our formation — to play three at the back — because with this system we found the right balance offensively and defensively, it was important for our season."
Source: tribalfootball.com