The Sun says it was the Italian who managed to talk Terry round to rejecting Manchester City.
A source close to Ancelotti said: "No one asked Carlo to get involved in the Terry situation but he wanted to find out what was in the player's heart."
In the first meeting at the club's training ground, Terry told his new boss he wanted to stay at Chelsea until the end of his career.
The source added: "That meeting was very ]important as it made Carlo go back to the directors and ask what the solutions were.
"At that point, though, the club did not seem willing to make the first move so Carlo decided to get more information before going any further."