The former F1 supremo has already clashed with new seven time world champion Hamilton this year over his involvement in the Black Lives Matter movement.
"There's obviously no doubt about his talent," 90-year-old Ecclestone told La Stampa newspaper. "The results he has achieved speak for themselves.
"But outside of the track, he did a number of things badly. He could have achieved a lot more behind the scenes if he had been more quiet."
"He is doing well in the sport and he will continue to do well," he said. "But I still don't think we will see anything special from him in the future."
"Back then, it was the drivers who were behind the wheel, while today everything is done from the pitwall."
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