He said: "It's not important being at the top now - it's important in May. Last season we went down the table after Christmas, so this season after Christmas is a new season."
Charlton's Mark Fish has recovered from injury but is expected to start on the bench. Jimmy Floyd Hasselbaink is back for Chelsea after serving a ban but Eidur Gudjohnsen, Juan Sebastian Veron and Emmanuel Petit are doubts through injury.
Charlton v Chelsea, The Valley, Boxing Day, 12.30pm (Live on Sky Sports 2)