Mancini took over as City boss in 2009 and understands that success on the pitch will allow him further power over issues such as player transfers in the future. But the Italian tactician, who helped the club claim their first silverware in 35 years last campaign, appears to be growing frustrated as next season looms.
"Maybe for me it's difficult because I have only been here for 18 months or so," Mancini told The Sun. "Maybe I need to have more control of the team and the other situations.
"For a manager, that's very important. Maybe if I win the Premier League this season it will be different. But it's important for the manager to have control over the players and the medical staff and the other situations. It can improve.
"I agree with [Sir Alex] but he has been at United for a long time, so for him it is easy. He has to be in control of everything, doesn't he?
"It's different from Italy and I prefer [the] English style because if the manager loses the manager is sacked, and so I think the manager needs to take every decision. If he makes a mistake, he pays for it."
City's board were hoping to offload players such as Carlos Tevez and Emmanuel Adebayor before making bids for their top targets, such as Atletico Madrid's Sergio Aguero. However, Mancini feels valuable time has since elapsed as his side continue their pre-season preparations, and City are yet to sell their unwanted players.
"At the moment we are not ready to play for the title. But maybe in two weeks we will be ready," Mancini said.
"I think we can get the players we want. I think in football anything can happen, football is strange for this. But if we want to compete for all competitions we must have players - but we are working for this.
"Teams like United and Chelsea don't need to buy six players. Maybe they only need two or three and they are OK. For us, it's different and difficult. This could be the last season that it is like this for us.
"Maybe next summer we will just need one or two players."