He was diagnosed with a subdural hematoma and underwent surgery to remove blood clots from his brain the following day.
Trebek himself echoed those sentiments in a video filmed in his home, calling the incident a "slight medical problem" and assuring fans that he would be back in the studio soon. "Jeopardy!" tapings are expected to resume in mid-January.
Trebek's medical leave of absence is not expected to affect the broadcast schedule for the show, which is taped months in advance.
Trebek has never missed taping an episode in all these years, and was only replaced once: when he and "Wheel of Fortune" host Pat Sajak switched places on April 1, 1997.
In May, he renewed his contract with Sony Pictures Television to host the show through the 2019-2020 season.