The Tottenham forward has urged the highly-rated youngster to remain with AZ for the foreseeable future and resist the lure of a move abroad for the time being
The 18-year-old, who plays for AZ, was called up to the Oranje's provisional squad for Euro 2012, but was one of four players to have been omitted from the final squad, which was announced on Saturday.
Van der Vaart recognised the need for Maher to maximise his potential, and offered advice to the young midfielder, who has already been linked with moves to English sides Manchester City and Arsenal.
"Stay for a few years at AZ, or at least in the Netherlands. It is much harder to get a place [in a team] abroad, and you will only be a good player by playing," the Tottenham attacker was quoted as saying by De Telegraaf.
"Adam has surprised me in a positive sense. [He] has much talent, and he shows here in the camp, that he is ready for the Oranje. [That is] the first exercise that often fails any newcomer."
Bert van Marwijk's side continue their preparations for Euro 2012 with friendlies against Bulgaria, Slovakia and Northern Ireland before their Group B opener against Denmark in Kharkiv on June 9.