Ghana international Mohammed Kudus is yet to get work permit from Dutch authorities to start life at Ajax Amsterdam.
Dutch authorities are yet to clear the 19 year old.
Kudus joined teh Dutch giants from FC Nordsjælland last month on a five-year deal.
The talented attacker was absent when the club started the third and last block of preparation for the new season on Saturday.
He was not the only player as goalkeeper Andre Onana and captain Dusan Tadic were also missing.
"Onana has an ankle injury," said trainer Erik ten Hag after the practice session.
"Tadic has to do some medical tests and Kudus has to prepare the last papers before coming to the Netherlands."
The Dutch champions paid 9 million euros plus bonuses and add-ons, making Kudus the most expensive teenager in the history of Ghana football.