The Italian boss revealed last week that he had received interest from seven or eight clubs during the summer but instead opted to sign a new contract with the North West outfit.
"Why do you keep asking me about last month and last season?" said Mancini in a press conference. "Why do you keep asking me about last year? I stayed here, my work is here. I believe in the future of this team.
"For 15 years the club won nothing and now we've won the Premier League and FA Cup in two years. I come here and I am polite and I answer your questions. Every year I may have one or two situations where I could leave the club but I want to stay here and work here."
Mancini's side are preparing for a must-win Champions League fixture against Ajax tomorrow.