The Northern Irishman won the last of his four major titles in 2014.
McIlroy has struggled to perform to his best in the PGA Tour’s fan-free environment since it returned in June.
Rory McIlroy says he doesn’t lose any sleep over his lack of major wins.
The American has apologised and accepted the European Tour’s decision.
Tiger Woods and Jon Rahm don’t mind that the PGA Championship will be played without spectators.
The American is aiming for a third straight triumph in the tournament at Harding Park.
The 44-year-old has had just four competitive rounds since mid-February due to injury and the coronavirus pandemic.
He has good memories of Harding Park and is hoping he can be in contention for a second major title.
The American pair opened strongly on Sunday to eke out a gap on the chasing pack.