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That’s the view of BBC Sport pundit Garth Crooks.
City edged past West Ham yesterday in a 2-1 win thanks to a late David Silva goal.
Pep Guardiola’s men still boast an eight point lead at the top of the Premier League table heading into Sunday’s Manchester derby.
And Crooks says United, who stunned Arsenal on Saturday and won 3-1 at the Emirates, should be worried about City picking up points when they’re not playing well.
“I thought West Ham played really well and deserved to get something out of their match at Manchester City,” Crooks told BBC Sport.
“Nevertheless, the very best teams seem to manage to get the points when they need them, and there is no doubt about it: Manchester City are on a roll.
Arsenal and Manchester United combined XI
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“Manchester United need to be concerned before next week's derby”
Garth Crooks
“It wasn't one of City's greatest performances either, but they just did enough. And in the absence of midfielder Kevin de Bruyne in my team of the week, I suppose it's fitting he is replaced with David Silva.
“I was so impressed with his performance against the Hammers because he appears to be another player who has had to adapt to the 'Pep Guardiola philosophy'.
“We all know Silva is an immensely gifted player, but this season I have seen him get into areas he wouldn't have dreamed of getting into under Roberto Mancini or Manuel Pellegrini.
“His winning goal was a perfect example of Silva getting in where it hurts. His display against the Hammers was a captain's performance if ever I saw one.
“Manchester United need to be concerned before next week's derby. City are picking up points, even when they are not playing well.”