The Blues’ moved 5 points clear of Manchester City with a comfortable dispatching of Swansea City on Saturday afternoon.
Filipe Luis replaced Azpilicueta whilst Gary Cahill came back in for Kurt Zouma. Petr Cech remained between the sticks as Tibhaut Courtois recovers from a broken finger.
The Swans, looking for their first ever Premier League win over Chelsea, drafted in Frenchmen Bafetimbi Gomis in place of the departing Bony whilst youngster Tom Carroll started in midfield.
And it was the young Englishman that miscontrolled a Gylfi Sigurdsson pass, allowing Oscar to take full advantage and fire home from 18 yards.
Sigurdsson sought to make amends straight away, firing against the frame of Petr Cech’s goal.
However this would be the closest the South Welsh team would come, as first a brace from Diego Costa before Oscar earned his second put the visitors 4-0 up at half-time.
Cesc Fabregas the provider, Costa rounded off a superb team move to put the Blues’ two up before collecting a wayward Federico Fernandez backpass and slotting past Fabianski.
Oscar got his seconds moments later to make it a case of job done even before half time.
The fifth and sole goal in the second half came in the form of the much-maligned Andre Schurrle, who pinched a tap in off the toes of Oscar after a mazy Branislav Ivanovic run.
In truth, Swansea offered little in their worse defeat of Garry Monk’s reign, however it must be said that Chelsea were fantastic in all quarters today.
Chelsea, who were playing before Manchester City’s Sunday afternoon clash with Arsenal put daylight between themselves and the champions.
Chelsea boss Jose Mourinho, who is currently contesting a FA charge for misconduct, told BBC Sport his side weren’t under any pressure from second place Manchester City.
“I don’t think they feel it – they have to win, but they know that” he said.
“We don’t feel pressure – we feel responsibility.”