Italian sends out a message to the top bosses at Eastlands that further spending is required if the club are to achieve the kind of success that they aspire for
City have spent a massive amount of money since Sheikh Mansour took over the club, through Mark Hughes' time as well as after the arrival of the Italian.
The former Inter boss has come close to wrapping up fourth place - and a qualifying spot to next season's Champions League - as the Eastlands outfit are six points ahead of their nearest rivals Tottenham Hotspur.
Now the Italian has encouraged the upper echelon to continue a similar style of spending on transfer - as they have in recent transfer windows - to ensure that success is achieved.
"For us to stay near the top for a long time was good," Mancini told reporters.
"But during a moment in the season, like February or March when we played Europa League, Premier League and FA Cup, we played every three days.
"It's very difficult if you don't have a big list of players - it's impossible to go on for the final of these cups and play for the title."
Mancini added weight to his belief by citing how arch-rivals Manchester United were able to play a changed line-up against Schalke and yet register a 4-1 victory.
He added: "United will play eight or nine different players from the side that played Schalke for the match against Chelsea. They can make these changes and still win.
"I think we have a good team. We should improve - if we buy other players - because when you play in the Champions League every team is strong."