Gravenberch isn't that good. I follow Dutch football and he is one of the worst in Ajax starting XI.
I searched on some Ajax forums and most of the people say he is not on Ajax level, he is inconsistent (play 2 matches good and 8 the worst on the pitch). His effort is shit a la Rabiot and they say he isn't really ... any type of player. He is not a B2B, not a defensive midfielder, not a passing midfielder, he is litteraly strayed on the pitch. On the other side a lot of Ajax supporters believe in his potentiel but the things above are an issue for the fans. I would say max 20 million.
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https://www.voetbalzone.nl/doc.asp?uid=397703
For example translate this comments.