"Clarence has no experience as a coach and will have to prove himself quickly," Gullit told Dutch media on Wednesday.
Van Basten, a former Dutch national coach and now at Heerenveen, said he could understand some of the rationale of selecting Seedorf but that the Italians were running a major risk.
"Milan is a massive club that is currently suffering from a lot of problems," Van Basten told Dutch NOS television. "I think they could have rather used an experienced coach."
(Reporting by Mark Gleeson; Editing by John O'Brien)
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