Nate Diazsays he is NOT fighting Khamzat Chimaev -- regardless of who wants to see them scrap -- telling TMZ Sports the Chechen fighter is a "rookie" who flat-out just ain't on his level.
We talked to the UFC superstar at Brickhouse boxing gym in North Hollywood ... and we asked him about the potential fight with Khamzat.
"They're coming at me with [Khamzat], and I'm like, 'hold on, don't disrespect me like that, trying to offer me a fight with a rookie.' I'm cool, you got 4 fights in the UFC. Don't even talk my name," Nate told us.