Sergio Aguero, Vincent Kompany and Fernandinho were all on the scoresheet for the Citizens, who started fast and punished the Blues in the first big contest of the Premier League season.
Things could have been different had Fernandinho seen red for an apparent elbow on Diego Costa, and the 'Special One' also believes Yaya Toure could have been dismissed for two bookable offences.
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"My feeling? (It should have been a) red card. Yaya Toure should also have had a second yellow card, but the score was 3-0 so it had no relation to the result, but it had a relation to the rules," said Mourinho post-match, according to the official Chelsea website.
The Blues boss also spoke on the arrival of Baba Rahman, with Chelsea confirming the signing of the Ghanaian left-back, subject to a work permit.
Rahman moves to west London from Augsburg to replace Felipe Luis, who was sold to Atletico Madrid earlier in the summer. The defender will challenge Cesar Azpilicueta for a place in the Blues line-up.
"It’s important because he’s a left-back and he can compete with Azpilicueta. At the same time, Azpi can also compete with Ivanovic for the right-back position," he added.
"This player replaces Filipe Luis in terms of the balance of the squad. Hopefully next week he will be ready."
Chelsea next travel to the Hawthorns to face West Brom before hosting Crystal Palace at the end of the month.