The European Tour has confirmed the postponement of its events in Morocco and Stockholm in June.
The Trophee Hassan II, scheduled for Rabat from June 4, and the Scandinavian Mixed, from June 11, will be re-scheduled at a later date.
In addition, the Lalla Meryem Cup on the Ladies European Tour, which was due to run concurrently with the Trophee Hassan II, has also been postponed.
“We will continue to monitor the global situation in relation to Coronavirus and evaluate its impact on all our tournaments, with public health and well-being our absolute priority,” European Tour chief executive Keith Pelley said.
“Discussions regarding the possible rescheduling of all postponed tournaments will remain ongoing until we have clarity on the global situation.”
Former world number one Jason Day and American Brendon Todd share the lead.
Koepka is part of a nine-strong group on four under in California.
Tiger Woods is also in the mix after an opening-round 68.
Koepka carded an opening four-under-par 66 to trail Jason Day by a stroke while Woods was two shots further back.
The American is targeting a third consecutive US PGA Championship title.
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.