Mertesacker - part of a rearguard which has only been breached twice this season - sees no reason why Arsenal cannot head to the Etihad Stadium in a confident mindset.
"We are convinced that we can stay in the league, at the top, and that's our target for Sunday," he said.
"Last year we lost at Man City. It was a very tight game so we will try to do better this time."
Mertesacker added on Arsenal Player: "I feel like we are in a better shape than last year, because we are now in a good shape from the beginning [of the season]. I think we are well prepared now."