Mancini's future looked in doubt after Inter's loss to Liverpool in the Champions League in March. He said he wanted to quit at the end of the season only to change his mind the next day.
Inter had to wait until the last day of the season to clinch the Scudetto after a 11-point lead over Roma fell to one point.
Mancini is considered a possible candidate for the vacant Chelsea job following Avram Grant's firing last Saturday.
The Israeli Grant had taken over from ... Mourinho.