Devin Booker says he's currently fighting COVID ... revealing on a Twitch stream over the weekend he's been battling the virus for about a week -- and it's sapped him of his taste and smell.
The NBA superstar -- who's been famously dating Kendall Jenner for the past year -- broke it all down for his followers while playing "Call of Duty" on Sunday.
"I got the 'vid, man," Booker said ... adding later in the stream, "Honestly, I'm feeling straight, man. Only thing that I'm dealing with is no taste, no smell. Which is the worst part of it."
"But," Booker continued, "I'm about a week in. I'm going to be back in no time. No time."
Booker -- who vacationed all over the globe with Jenner in August -- declined to say if he was vaccinated or not ... but did mention on the stream, "You can still get COVID with the vaccine."
Booker is now expected to miss the start of the Phoenix Suns' training camp while he recovers from the virus.
It's unclear, meanwhile, if Jenner has also contracted COVID.
Get well soon, D-Book.