The Scot has enjoyed a strong start to his reign at the Hawthorns, with the Baggies currently sitting seventh in the Premier League after securing 14 points from seven games.
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"I think we are where we are. We don't need to be tested," the manager told his team's official website.
"We've had a good start and proved we can stand up to anyone at the Hawthorns - and we hope to do that against Manchester City. We will make sure we're ready for the visit of the champions.
"My opinion is the season starts after this international break.
"This is the juncture where you fight for position and the next run of games takes you into November and December where the season really takes shape and you have a run of tough matches."