Italian saw his side rise to the top of the table once more with their 1-0 win over the Red Devils, but the former Inter man believes their rivals have an easier final two games
City top the Premier League with a superior goal difference with just two games remaining and have the chance to claim their first top-flight championship in 44 years if they can match United’s results over the final two games.
City's next game is at Newcastle whilst United host Swansea and Mancini believes their concluding fixtures to the campaign make the Old Trafford side favourites for the title.
"It is not finished," Mancini told reporters. "If we think it is finished, we will be making a big mistake.
"United are the favourites.
"They have easy games. They play against Swansea and Sunderland.
"We have two strong games, Newcastle and QPR. One plays for the Champions League, the other for relegation.
"It is important that we are on the top now but it is more important to be there after May 13."
Sir Alex Ferguson seemed to set his side out in a defensive formation, in the knowledge that a point would keep them in pole position for a 20th league title and Mancini believes that United were playing for just one point.
"It was important for them to play for a draw because the championship would have been finished," he said.
"We played better. We deserved to win but it was difficult because they had all the players behind the ball."
In four games City have managed to claw back an eight point deficit and Mancini admits the situation is bizarre.
"Football is crazy," he said.
"It is important to always believe in yourself when you have a bad moment. We were on the top for 28 games and I think we deserve another chance.
"But in two games, anything can happen.
"It is enough for my players that they remember six weeks ago and we were four points ahead of United. In two games we lost everything. Up to now, we have done nothing."