Derby granted Chelsea permission to speak to Lampard last week and the 41-year-old has now completed a move back to his former club as the permanent successor to Maurizio Sarri. Chelsea are expected to pay Derby £4m in compensation for Lampard, who was excused from reporting for pre-season training with the Championship club on Monday.
After sealing his return to Stamford Bridge, Lampard told Chelsea’s website: “I am immensely proud to be returning to Chelsea as head coach.
“Everyone knows my love for this club and the history we have shared, however my sole focus is on the job in hand and preparing for the season ahead. “I am here to work hard, bring further success to the club and I cannot wait to get started.”