"Chelsea changed and bought some new players, City bought four or five new players," he told BBC World Service.
"After many years, it's the time [for United] to refresh the team."
Mancini added on Moyes: "I think there is a good chance for him - he worked for 10 years at Everton and he did a really good job.
"He is a good manager and I don't think he needs my advice."
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