The Daily Express says Torres has been signed with the specific intention of eventually replacing Didier Drogba, the 32-year-old who has been the focal point of Chelsea's attack for the past seven years.
Drogba, who will initially line up alongside Torres, has been a phenomenal success, helping the club win three titles including one Double - and in the process scoring an extraordinary 141 goals in 286 games.
With Drogba increasingly injury-prone, the feeling is that he may have at most two seasons left at this level. So, for Ancelotti, the first puzzle is playing the two strikers together. For the past year he has favoured a 4-3-3 formation with three forwards - but both Torres and Drogba favour playing a central role. It looks now as though Chelsea will have to switch their system to accommodate Torres, by reverting to the twin striker form Ancelotti adopted when he first arrived. He may go with a diamond midfield or a flat middle four in an orthodox 4-4-2.
Anelka, at one point mentioned as a makeweight in the deal, is the man who will miss out.