Ancelotti would like to be in a position where you replace quality with quality, but if you take the recent home defeat against Sunderland as an example, Chelsea's central defence was an accident waiting to happen.
With Michael Turner unavailable because of a four-match suspension, Sunderland boss Steve Bruce turned to Paulo da Silva to partner John Mensah in central defence, while captain Lorik Cana replaced the injured Lee Cattermole in midfield.