Tottenham boss Redknapp: Mancini needs more than Man City cash to win trophies
Redknapp said Mancini would not necessarily find that all his problems were solved with more new players in January.
"Manchester City are a one-off, there are not a lot of clubs with that type of money," Redknapp said. "In fact there is no one, they are quite unique with the man who owns the club but we have spent decent money and I am happy with the squad.
"Sometimes if you buy you can cause yourself more problems. The more players you have of that quality, the more difficult it becomes. The more players you've got walking around with the hump, and the more difficult it can be for you. I think what they [City] would probably do is if they agree to buy someone they'll probably have to shift a few out, because you end up over-loaded with them. And I think it can be a bigger problem, it can upset everything with too many."