Manchester City manager Pep Guardiola is the "Special One" rather than his United counterpart Jose Mourinho, according to former Red Devils midfielder Roy Keane.

Mourinho famously said "I think I'm a Special One" upon his appointment as Chelsea boss during his first stint at Stamford Bridge in 2004.

However, Mourinho's current side United were beaten 2-1 by rivals City on Saturday, and Keane, who made 480 appearances for United, has been impressed by Guardiola.

"He said he's a challenging coach -- doesn't look like he messes about," he Keane said on ITV, in quotes reported by the Daily Mirror. "I wouldn't like to mess with him.

"Two coaches in Manchester. Mourinho reckons he's the Special One, to me this guy is."

City have won all four of their opening Premier League matches while they eased to a 4-0 victory in their Champions League match with Borussia Monchengladbach on Wednesday.

Keane said: "We've seen City have good starts before and they take their foot off the gas a little bit, but I don't think it will happen under this guy."