TV personality Alex Trebek is on medical leave from 'Jeopardy.'
Emma McIntyre, Getty Images

Alex Trebek is taking medical leave from Jeopardy! following surgery to remove blood clots from his brain after a fall.

Wearing a Jeopardy! baseball cap, yellow sweater and jeans, a subdued Trebek, 77, left a video message on the Jeopardy! YouTube channel Thursday explaining his condition and promising a quick return to hosting the quiz show.

"Some of you might have heard by now that during the holiday break, I had a slight medical problem," Trebek said in the video.

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The fall he "endured about two months ago" caused subdural hematoma or blood clots on the brain, he said.

Trebek underwent surgery in December.

"After two days in the hospital, I came home to start recovery," said Trebek. "The prognosis is excellent. And I expect to be back in the studio taping more Jeopardy! programs very, very soon."

The industry website Deadline reported Trebek will resume taping Jeopardy! in mid-January. Because the show is filmed months in advance, its broadcast schedule will not be affected by the medical leave with one exception — the upcoming College Championship, supposed to tape now, will film in March and air in April.