I don't think he's ready for Europe yet. He play some amazing games but also horrible ones. Cuca, Palmeiras new manager, will try him in different positions to get the best out of Gabriel Jesus so I think it would be wise to wait 6 months or 1 year to see how he develop.
btw, Palmeiras would only get 30% of this transfer so any team after him will probably have to pay a lot of money to make this worth. Or the player ask to leave.