The purchase of Robin Van persie by Sir Alex Ferguson was key this season as Manchester City boss Roberto Mancini says the club must move quickly to buy players if they are to regain the Premier League next season.
Rivals United won the title with a 3-0 win over Aston Villa on Monday, leaving City 16 points behind and Mancini looking for excuses as his highly overpaid squad failed to live up to the billing before the season started.
"You should move very quickly. We didn't do this last year," admitted 48-year-old Mancini.
"We moved so slowly. We lost the players that were our targets to improve our team."
Earlier this month, Mancini questioned the club's transfer policy, commenting: "I think we had the chance to win another Premier League if we worked well last summer but we didn't."
With five games left in the league, City are five points ahead of third-placed Arsenal with a game in hand.
"I think that when you build your team you need to start like in this case, in the end of this championship. We have time, but not a lot of time. We should have our targets in mind," the Italian added.
Manchester United's 20th title victory is to be recognised by a guard of honour prior to the game against Arsenal.