KSIsays Dillon Danis is persona non grata at all future Misfits Boxing events ... telling TMZ Sports if he ever sees the MMA fighter again, he'll "probably slap him in the face for all the disrespect he gave me."
As we previously reported, Danis backed out of his fight against KSI just days before the event was slated to go down in London ... with Misfits promoter Mams Taylor claiming his team told him Conor McGregor's buddy was underprepared to enter the ring.
We spoke with the 4-0-1 boxer about the whole ordeal ... and he's slamming the door on ever setting up another bout with Danis.
"No, I don't," KSI said this week. "I want him to go into irrelevancy. I don't want anything to do with him anymore. He's banned from Misfits. I don't ever want to see him anywhere near Misfits."
"I'm never gonna fight him, and if I see him, I'll probably slap him in the face for all the disrespect he gave me throughout this buildup."