Ibrahimovic joined AC Milan from Barcelona on loan with a view to a permanent deal last week.
Manchester City were reported to be interested in signing Ibrahimovic this summer.
“City must fight Manchester United, Chelsea and Arsenal – sides which took years to build,” said Ibrahimovic.
“City are still a side for the future. I chose Milan because they are a team that can win prizes now.
“City can wait for the future but I can’t.”
