UFC star Dustin Poirier says when it comes to Khabib Nurmagomedov there's no need for trash talk ... telling TMZ Sports, "He knows what’s up. I know what’s up. Let’s f*cking fight."
Poirier is still sporting bruises from his 5-round war with Max Holloway at UFC 236 on Saturday -- but he's already looking forward to his next challenge ... a lightweight unification fight with with Khabib.
Dana White has previously told us he's targeting a Sept. fight date -- and Poirier says the timing couldn't be better.