Goal hero Cahill has questioned whether City's massive spending spree will bring the results they want in the long run.
The Aussie, 31, said: "Man City are a big team now with where they are in the table and in the world of football. But what we have here at Everton is a close group and a good base of lads who really love the club.
"And with the youngsters coming through, I wouldn't want it any other way.
"What has happened there is a dream come true for City, but it is also hard.
"They need to put all those ingredients together in a way which will give them a team with longevity.
"We have good players here and we get excited about these big games. They have got some big names but we can compete with anyone."