Gullit wanted to see the former Bologna striker move to Milan this past summer.
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He told La Gazzetta dello Sport: "Zirkzee should have gone to Milan instead of Manchester United. He knew Serie A and a couple of extra seasons in this competition at a top club like Milan would have been perfect for his development.
"Now he is in a club with many problems, which hinders his growth.
"I hope that Zirkzee can turn it around, although it is natural to need some time to settle. He is undoubtedly a good player, but it is difficult to do well at Man United at this historical moment."