Manchester City manager Pep Guardiola has admitted he was surprised by Mikel Arteta during their FA Cup encounter on Friday night.
The Citizens registered a 1-0 win in their fourth-round tie, with defender Nathan Ake scoring the game's only goal in the second half.
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Guardiola revealed he was surprised with the his former assistant set out his stall at the Etihad.
"I didn’t expect this approach with this courage, the man-for-man, when this happens it makes the process difficult. In the second half we make contact more than usual with Erling [Haaland], it’s what you have to do," the City manager said, as per Manchester Evening News.
"Now I know they can do it in a few when we go there. They saw what we can do, we saw what they can do," he said.
"Maybe we change something, especially for the players, you select and of course when you play man-to-man, Rico [Lewis] is not as much necessary like, for example, Kyle [Walker]."
When asked if City can expect more teams to adopt Arteta's tactics, he added, "More than welcome, they can do whatever they want..
"We know we play many times in these seven years teams with man-to-man marking, we know exactly what we have to do but sometimes the opponent it is not easy."