The son of the Manchester United and Ajax legend Edwin van der Sar was this week revealed to be signing up with the Dutch club.
Also a ‘keeper, Joe had previously been playing in Manchester United development squads before his father retired in 2011 and returned to Holland.
The 15-year-old had been playing for amateur side VV Noordwijk just has his father had done before it was confirmed he would be joining up with the Amsterdam side.
“Yes, he will go to Ajax. For the rest I don't want to say anything about it. Joe will of course get a hard time anyway due to his surname,” he said.