Borg (11-3), of Albuquerque, New Mexico, is currently in Denver, where his newborn son has undergone two brain surgeries this week. Sources confirmed Borg, 24, has withdrawn from his fight Friday, following an initial report by MMAFighting.com.
"Anthony's second surgery went well, but he unfortunately is having complications breathing and is hooked up to a breathing respirator," Borg wrote on social media. "He also underwent a blood transfusion this morning along with being hooked up to an EEG machine to check for possible seizures.
"Tough times ahead, thank you for your continued prayers."
In a social media post earlier this week, Borg revealed his son has been diagnosed with Hydrocephalus, a build-up of fluid in the brain.
This is the third time a matchup between Borg, a former title challenger, and Moreno has been canceled.
Borg was supposed to face Moreno at UFC 223 earlier this month in Brooklyn but withdrew during fight week due to an eye injury. The injury allegedly occurred during Conor McGregor's attack of a UFC bus at Barclays Center. Borg said he was hospitalized after shards of glass went into his eye.
The UFC has not yet stated whether Moreno (14-4) will remain on the event.