The 30-year-old was heavily rumoured to be a transfer target for the Old Trafford outfit, but opted to remain in his home city.
And De Rossi has insisted that Rome is where the heart is, claiming a move to the north west of England would have driven him to take drastic measures.
"Thank goodness I did not go to Manchester, otherwise I would have committed suicide by now," he is quoted as saying by Corriere dello Sport. "Had I gone, I would never be able to see a lot of Rome."
De Rossi is currently enjoying a successful season at the Stadio Olimpico, with his club sitting second in Serie A, while United are faltering under the leadership of David Moyes in the Premier League.
A one-club man, De Rossi has made 16 appearances for Roma so far this season, scoring one goal.
