It changed everything. By putting Sterling in, it meant Fernandinho didn't play. Then, not only was Sterling ineffective, but, he took the place where Foden had been excelling, and therefore in the 1st half in particular, Foden was negated. He barely had a touch.
The fluency of the team had gone; we never put any real pressure on Chelsea - the opposite happened. They looked very comfortable when they got the ball. We had minimal shots on goal. And, there was no defensive shield in front of Stones and Diaz. A hole opened up where Havertz danced through for the goal.
That one player choice made ALL the difference, and I think that thousands of City fans across the globe will have feared exactly that when we saw the team selection.
Pep changed a winning formula - again - and came up short.
So bloody frustrating. But, a double - including the premier league - is a hell of consolation, thank goodness.