The Portuguese coach is said to have told the Dutch midfielder that moving to England was not the right option this summer despite interest from Sir Alex Ferguson's outfit
The 27-year-old Netherlands international has admitted that he spoke with the Premier League side over a move to Old Trafford after the Italians considered selling him.
However, the transfer was never forthcoming and Sneijder admits Mourinho influenced his decision.
"Mourinho called me and he told me to stay. He has an Inter heart and he has always told me to remain," Sneijder told La Gazzetta dello Sport.
"I am happy to have stayed because I never wanted to leave and so I no longer want to speak about Manchester United."