Jennings previously spoke about one of the final conversations he had with Trebek, which took place shortly before the beloved game show host died.

\"I spoke to him on the phone actually the weekend he passed and he was -- he was frail but he was still very much Alex,\" Jennings, who holds the record for the longest winning \"Jeopardy!\" streak, said on \"Good Morning America.\"

\"I remember him just being very confident in me to be a guest host if he ever needed that,\" he continued, adding that he was reminded by Trebek that \"the host is not the star of 'Jeopardy!'\"

Jennings went on to explain that Trebek \"always made it about the players and about the competition,\" adding, \"It's just hard to imagine that in the TV landscape today, a star of his size saying, 'Hey, the game is not about you' -- but that was great advice.\"

Video: The story of 'Jeopardy!' host Alex Trebek

According to a statement from the show, Trebek's final day of filming was Oct. 29 -- just 10 days before he died of pancreatic cancer on Nov. 8 at the age of 80.

The first episode of the Jennings-helmed \"Jeopardy!\" premieres at 7 p.m. ET Monday on ABC.

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