Mourinho has been hailed for his tactical approach to the game, but the Portuguese manager has revealed that it was his Scottish colleague who inspired the players with a rousing pre-match speech.
"I didn't speak to the team - I am serious," Mourinho told reporters. "It was Billy the masseur who spoke to them.
"He was screaming so much in a Scottish accent, going grrr, grrr grrr, that I didn't understand, but the players were clapping so they must have got it!
"I am serious. The last time I spoke to them was at lunchtime. It was Billy's team talk I'm telling you. Billy was fantastic today, I didn't understand, but it looks like the players they did understand."
The result moved Chelsea level on points with City in the table, but they still trail leaders Arsenal by two points.