Stipe Miocic says it "kinda sucked" when Brock Lesnar was in the mix for a UFC title fight with Daniel Cormier ... telling TMZ Sports he didn't think it was fair since Brock hadn't fought in years.
Remember, Stipe had defended the UFC heavyweight title THREE TIMES (the most in UFC history) before losing to Cormier at UFC 226 in July 2018.
Stipe -- and many UFC fans -- believed he deserved an immediate rematch with Cormier ... but when Lesnar expressed interest in fighting DC, it seemed Brock became the priority.
Lesnar eventually ended talks with the UFC so he could turn his full attention to his WWE career ... and that's when the UFC decided to give Stipe the fight in August at UFC 241.
Miocic tells TMZ Sports the whole waiting game for Lesnar rubbed him the wrong way -- explaining, "I mean, the dude hasn't fought in like, 3 years. Been popped twice, suspended."
"It's like, how you gonna put a dude like that ... he's not even a money fight anymore."
Miocic continued, "When he fought Mark Hunt, it didn't get a lot of Pay-Per-View sales. So, what's the difference of bringing him in? So, I don't know, whatever, it's all good."
"Brock's doing his thing. Good luck with everything he does, but right now, it's me and DC."
The two are set to square off on August 17 -- and if you watch the clip, you can tell Miocic is laser focused on getting his revenge.