The 37-year-old pop singer is taking a break from the road due to bruised vocal cords.
The Aerosmith guitarist plans to return to the road in 2019.
The “This Is America” rapper was allegedly seen nursing a preexisting foot injury last week in Las Vegas.
He’s scheduled to undergo brain surgery on Friday to relieve swelling.
Verzilov fell ill following a court hearing in Moscow.
As a result, the UK outfit has canceled all of its remaining 2018 tour dates.
The experimental singer had six tumors removed from her uterus in December 2017.
The game show’s longtime host had blood clots removed from his brain last month.
Longtime pianist, organist, and backing vocalist has been forced to miss the band’s recent North American and European tours.
Following a battle with stomach cancer, the soul legend will tour North America this summer and fall.