The Dutchman's Fulham visit United this weekend.
"Rene helped me when I first came here," Moyes said.
"I had several conversations with him. He helped me, told me about the club, how it runs and the players.
"In the end I would have liked him to stay at the time but he wanted to go and that was fine.
"I am looking forward to getting Rene back and seeing him."
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