Some were unhappy with Conte's appointment given his Juventus background.
But Pellegrini told TMW Radio: "He is largely positive. There is no doubt that he is a leader, a driver, one who knows young people very much and takes care of the details, both on and off the field.
"He was the coach who will succeed with Inter. Give him time and he will do big things."
On Juve leading the standings, Pellegrini added: "Juve proved in the two direct matches to be superior to Inter, even though Inter played a great first half in the last match. I really like (Paulo) Dybala, I would have liked him so much at Inter."