Wigan are fighting for survival, and Rosicky says there is no chance that he or his team-mates will underestimate their opponents.
"We'll have to be on top of our game to win, no doubt about it. Wigan have some very good players and a good young manager, so this will be a very tough match for us.
"We have a great chance to stay in [third] position, but now we have to make sure of it. That starts against Wigan on Monday - and make no mistake, it's a very big game for us.
"People might not usually regard a match against Wigan as such a big one, but they are still battling relegation, so there is a lot at stake for both of us.
"We saw what can happen against a team fighting for its life when we played away at QPR, and we expect the same kind of performance from Wigan on Monday. We have to give 100 per cent to get the result."