Manchester United boss Sir Alex Ferguson believes you have to "admire" City, despite being embroiled in a battle of words with their Premier League title rivals this week.
On Friday, Ferguson hit back at comments from former City midfielder Patrick Vieira after the Frenchman questioned United's decision to bring Paul Scholes out of retirement.
Ferguson warned Roberto Mancini's side he has "plenty of ammunition" if they want to engage in mind games, highlighting Carlos Tevez's controversial return to the City side after a five-month absence.
And, after City went level on points with United at the top on Saturday, the Mirror quotes the Scot as saying: "Experience is important, no matter who you are. If you've been there before, it helps.
"It's not absolutely conclusive that it will apply this season because you've got to admire City.
"They've done exceptionally well and been top of the league for a long time. They've got us to go to the Etihad and they've not lost a game there.
"Individuals and teams can win games, but I think what is important now is how the temperament is - how they hold their nerve."
"What we've got to get used to and it's the same for every United and City fan is there's going to be big games involving the two teams for the next decade.
"It will be semi-finals and finals, whatever, because the two teams will be at the forefront."