Kawhi Leonard leaving for the Clippers doesn't mean a damn thing to Toronto Raptors star Pascal Siakam right now ... 'cause he tells TMZ Sports he's too busy being a champion!!!
Siakam -- the NBA's most improved player in 2019 -- was out in L.A. when we asked about The Klaw bailing on the 6 right after he helped win them a title ... and he's not sweatin' it one bit.
"We're still the champs right now, so I'm still enjoying that," Siakam said. "Imma figure out next season, next season.