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Raducanu split from Sebastian Sachs in the summer, the fifth coach who has come and gone since her emergence at Wimbledon two years ago.
And Frenchman Mouratoglou has been critical of Raducanu, who has come under fire for the rapid succession of coaches she has worked with.
"I understand it's not easy to trust someone but that's also what makes the careers of players. They have the ability to stick to people that they believe in, to a project they believe in and not change whenever there is anything wrong because it's a marathon," he said.
"You have to accept that during a marathon you have ups and downs and every time you have a little down you get rid of the people, you can't reach the finish line in one day."