*R. Kelly is on an indefinite hiatus after undergoing emergency throat surgery on Tuesday.

As previously reported, Kelly had complained of severe throat pain before being sent to Northwestern Memorial Hospital in Chicago by a specialist. There, doctors drained an abscess on one of the singer’s tonsils.

“It is not known” when he will be able to resume performing, publicist Allan Mayer said in a statement to The Hollywood Reporter.

But Kelly tweeted Wednesday that he’d be back to form soon, “I’d like to thank everybody for their love, concern and support. I WILL BE BACK!”

Kelly recently completed the U.S. leg of his Love Letter tour.

He mentioned his throat issues in a tweet last week, “I refuse to take another cup of theraflu! I feel like my throat is coming back. I’ve been in bed sweating like crazy.”