The introduction of Romelu Lukaku proved pivotal as Chelsea won 3-1 away to Aston Villa on Boxing Day, Thomas Tuchel's side getting the victory after dominating possession for long spells throughout the second half.
The Blues had fallen behind to a Reece James own goal, but they responded just six minutes later when Jorginho converted from the spot after Callum Hudson-Odoi, who was excellent on the night, was taken down in the area by Matt Cash.
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Lukaku came on at half-time and added a focal point to Chelsea's wide play, with Hudson-Odoi and Christian Pulisic returning to their more supportive roles.