In this brand-new footage of the rehearsal during which he injured himself, Ribeiro is seen limping and needing his partner Witney Carson just to stand up and walk.
"It took my breath away," the 43-year-old Fresh Prince of Bel-Air star says about the injury. "I started to feel incredible pain in my lower back, and every movement just started to just hurt more and more."
"You know, I really want to keep going," he adds. "But I just don't know if my body's going to let me continue."
But he's definitely not throwing in the towel just yet.
"Hey #TeamWitfonso thanks 4 all the love," he tweeted Saturday. "I'm working really hard to be able to dance Monday. Keep the prayers coming. Love you all."
And according to his wife Angela, the season 19 fan favorite is already feeling better.
"Went to rehearsal to help massage my hubby's back during breaks," she tweeted Friday. "He's much better today, thankfully. #TeamWitfonso."
Monday marks the show's semi-finals, in which he plans to face off against Tommy Chong, Bethany Mota, Janel Parrish and Sadie Robertson.
"I would say the kids are my biggest competition," he admitted to ET during Southern Comfort's World's Largest Group Toast event last Saturday. "They've got the stamina to go all the way."
But this also hasn't been the first injury Ribeiro has suffered during the intense season. Earlier this month, he told ET that he suffered a groin injury while bringing back the beloved Carlton dance.
"Groins take a long time to heal," he said. "Rest is really the only answer."