– Ron Gourlay, Chelsea chief executive
"Roberto's quality was clear for all to see when he galvanised the squad last season and helped the club make history, and the owner and board are very pleased he will be continuing his good work.
"We all believed he was a young coach with much to offer when we first asked him to take charge of team affairs in March and the manner in which he worked with us, the players and all the staff, and the success that followed, made him the clear choice when it came to selecting the person to take us forward in the seasons to come."
Chelsea' interim manager Robert Di Matteo has been appointed the permanent job on a two-year contract. He guided the club to victories in the FA Cup and the Champions League.