Manchester City didn't look themselves in the recent loss to Chelsea and the result has made the title race even more unpredictable, according to Arsene Wenger.
The Arsenal boss praised the performance put on by Jose Mourinho's side, but qualified that by claiming the Citizens appeared as though drained of energy.
Chelsea defender Branislav Ivanovic arrowed home the only goal of the game in the first half at the Etihad Stadium, a result that took the Blues level on points with Manuel Pellegrini's side and Arsenal sitting two points ahead of both of them.
"It [the title race] is never as simple as everyone predicts it," Wenger told the official Arsenal website.
"I said a long time ago that nobody will be absolutely above [the others]. It will be down to consistency.
"Chelsea looked always dangerous and Man City looked for me a bit jaded. They were not as fluent or as strong physically as they were at Tottenham but it could have gone to 1-1, it could have gone 2-0 for Chelsea."
While many have seen the fact that the Chelsea win saw Arsenal stay two points ahead of their title rivals in the Premier League title race, it was also an ominous performance by Mourinho's side.
Wenger will be hoping Manchester City stay jaded, as they had been scoring goals in bundles before the loss on Monday night and one less side to fight off for the trophy would be welcome.
The Gunners will have to be at their best next weekend if they are to maintain their lead at the summit, as a trip to Anfield and a clash with fourth-placed Liverpool will kick off the weekend fixtures.
It also starts a trying 11 days for Wenger's side, which includes another meeting with Liverpool in the FA Cup, a home Premier League clash with Manchester United and the first leg of the their Champions League last 16 tie against holders Bayern Munich.