The tweet stated that @JohnMayer had tested positive for COVID-19 just before he left for Mexico. He will not be able to perform at the "Playing in the Sand” event in Riviera Cancun.
CNN reached out to Mayer representatives for comment.
The group is comprised of ex-Grateful Dead members Mickey Hart and Bill Kreutzmann, along with Mayer and Jeff Chimenti.
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They will perform from January 7-10.
The band wrote Weir that they came down to have fun. "Unfortunately, some of our brothers can't make it but we're going for fun."
They were one group that broke the news last summer when they announced that their concerts would require vaccinations and negative COVID-19 test results.
Numerous celebrities, including Jimmy Fallon, Whoopi Goldberg and Jimmy Fallon, have tested positive for the Omicron variant as the Omicron variant continues to rise in the U.S.