While City chief Roberto Mancini has spent big, Fergie hailed his ability in piecing together a winning team.
He said: “Of course he’s had a big financial advantage but you still have to pick the right players. Trying to orchestrate harmony is very important.
“City, quality-wise are very similar to Chelsea under Mourinho, I feel.
“They are very hard to beat and several of their players have had an outstanding season.
“When you win the league, you need five or six players who are consistently good and they have had that.
“If you buy right there is not a problem but sometimes you don’t buy right.
“It has happened to us, when we maybe bought a player who wasn’t suited to us. But in the main, City have bought well.”