"And the moment they become champions, which will be sooner rather than later, I will react the same way other people reacted when I won three titles in this country".
Vincent Kompany put Manchester City ahead in the 25th minute, while Ilkay Gundogan then doubled the Citizens' advantage just five minutes later. Alxeis Sanchez who hasn't made an impact at United has had an excellent second half and is making United tick.
Mourinho has backed his side, however, to give the English Premier League leaders a run for their money in the battle for the three points.
Guardiola said: "If you win the pick-up [selection] is nice, we played good in the first half and in the second half as well, sometimes you have to understand and see what happens in the game affects the result".
Paul Pogba scored twice in two minutes to shock City and Smalling volleyed the victor to cap a memorable 3-2 win.
MANCHESTER, ENGLAND - APRIL 07: Chris Smalling of Manchester United celebrates scoring his side's third goal with Paul Pogba during the Premier League match between Manchester City and Manchester United at Etihad Stadium on April 7, 2018 in Manchester, England. He (Raiola) was all for Mkhitaryan and Pogba to play with us.
'Pogba's agent was optimistic providing him to Manchester Metropolis, ' Neville joked on commentary.
First half, you can imagine what everyone was saying about him.
The loss from last season is still in my mind.
The mental blow in the blue side of Manchester City that suffered a defeat in the Champions League is what bitter rivals Manchester United will be looking to take advantage of.
"When we are able to win 18 games in a row in the league, in the Premier League that was the key point, where they said: 'These guys will win the Premier League'".
The hosts got off to the flawless start when skipper Kompany replicated his 2012 header against United en route to the club's first title, beating Chris Smalling to the ball to steer a powerful header beyond David de Gea.