The 25-year-old German injured his foot badly in the semi-finals of the French Championships, against Spaniard Rafael Nadal in June, and has not been able to play since. Among other things, he was forced to stand over Wimbledon.
Zverev won Olympic gold in Tokyo last year, but is still waiting for his first grand slam title. The likely comeback on the field will now instead be in the Davis Cup, where he is selected in the German team that enters the group stage on September 13.