Hart joined Torino last week on-loan.
â€œIt was something which grew immediately," Petrachi told Sky Italia.
â€œWe had decided to take [Emiliano] Viviano but then Sampdoria didn't want to sell the player. The agent Vigorelli said he wanted to do something about it, and that he was in contact with Hart's agent.
â€œSo I thought that if City helped to pay part of his wages then it'd be a great opportunity, but I didn't want to be that 'idiot' who you tout the lad to before giving him to someone else.
â€œWe evaluated whether or not he wanted to come here, and we were all happy. [Coach Sinisa] Mihajlovic welcome him with open arms and he also found Attilio Lombardo here, who he knew from Manchester City.
â€œWe're pleased, it was a quick thing but also a calm one. I tried to keep everything as discreet as possible."