Producers announced Monday that Jennings, who won 74 games in a row and claimed the show’s “Greatest of All Time” title in a competition last year, will host episodes that air in January.
A long-term host to replace Trebek, who died of cancer on Nov. 8, will be named later.
“By bringing in familiar guest hosts for the foreseeable future, our goal is to create a sense of community and continuity for our viewers,” the show’s executive producer, Mike Richards, said.
The show is in its 37th year of syndication, and Trebek was its only host. It is still airing shows that Trebek filmed before his death.
Art Fleming hosted earlier editions of the game show, including the original “Jeopardy!” that debuted in 1964 on NBC and aired for a decade.
Richards said “Jeopardy!” will air repeat episodes for the holiday weeks beginning Dec. 21 and 28, meaning Trebek’s final week of shows will air starting Monday, Jan. 4.
Jennings’ episodes begin on Jan. 11.