Though the Blues are bound to start as favourites, Kompany believes playing at Wembley is a great leveller and there will be no complacency on the day.
"We know it won't be easy, especially as the pitch at Wembley is bigger than any other pitch in the world. It's enormous, trust me!" he told the City's website.
"The impression it gives you, whether it's the 90,000 fans or the actual size of the pitch itself, it's huge.
"Wigan play good football, their coach is Spanish, and they play in a system which is unique in the Premier League.
"They play 3-5-2, which means you have little time to get organised or get re-organised against a team like that. There's a risk, but we were woken up when we played earlier this month and there won't be a surprise this time."