UFC featherweight champion Max Holloway has been pulled from Saturday night’s UFC 223 pay-per-view event in Brooklyn, N.Y.

The UFC featherweight champion was declared medically unfit to fight after failing to make the 155-pound weight limit for a UFC lightweight title fight against Khabib Nurmagomedov.

Holloway took the fight on six days’ notice as a replacement for Tony Ferguson, who suffered a knee injury last week and had to pull out of the fight.

This is the fourth fight removed from the card in the last two days.

There was no immediate word if a replacement fighter would face Nurmagomedov.

Holloway apologized on Twitter to Nurmagomedov, saying he wants “to keep going but they are stopping me. Sorry to your team and the fans.”

Holloway was already the 145-pound champion and was trying to become a two-division champ by beating the undefeated Nurmagomedov in the 155-pound title fight at Barclays Center in Brooklyn. Holloway and Nurmagomedov were fighting for the lightweight title left vacant by McGregor’s nearly 18-month absence.

The original card had shaped up as the best of the year and UFC President Dana White said it was trending toward the best pay-per-view buy rate since McGregor’s last fight at UFC 205.

But the backstage melee McGregor allegedly instigated instead has forced the removal of three fights because of injuries from the attack. Artem Lobov, a close friend of McGregor’s, was pulled from the card for his involvement. Michael Chiesa and Ray Borg were hurt in the mayhem and forced off the card.

McGregor faces three counts of assault and one count of criminal mischief. Video footage appears to show the promotion’s most bankable star throwing a hand truck at a bus full of fighters Thursday after a news conference at Barclays.

Star-Advertiser reporter Billy Hull contributed to this report.