The 26-year-old completes manager Jose Mourinho's elite 23-man squad and ensures Chelsea have at least two top-class players capable of playing in every position. Mourinho had been considering signing a younger centre-back as cover for John Terry and William Gallas, such as AC Milan's Fabricio Coloccini, but is not convinced by the capabilities of Robert Huth, 19, so has opted for a player with more experience.