Athletes' families are also likely to be barred although organisers have yet to make a decision, Tokyo 2020 CEO Toshiro Muto said.
Muto said the decision on volunteers was regrettable but that organisers wanted to decide now so there would not be confusion for those people overseas who were waiting for a decision.
Organisers decided at the weekend not to allow in foreign spectators during the Games and would refund some 600,000 Olympic tickets and another 30,000 Paralympic tickets purchased by overseas residents.
