Mancini, who struck Roma's winner against Real Madrid on Tuesday night, is demanding £2.5 million-a-year to stay with the Giallorossi, while club chiefs have so far tabled a deal worth £1.7 million-a-year.
Mancini's agent, Gilmar Veloz, has already been contacted by Inter Milan in recent days as he prepares to return to Rome for a new round of talks.