It’s one of the deepest and most anticipated fight cards in MMA history, and it had avoided the injury bug – until now.

Former Invicta FC 105-pound champion Michelle Waterson (13-4 MMA, 1-0 UFC) has suffered an undisclosed injury and been forced out of her bout with fellow strawweight Tecia Torres (6-0 MMA, 2-0 UFC). A rep for Waterson confirmed her withdrawal with MMAjunkie.

A formal announcement hasn’t been made, but a replacement is being sought for the short-notice bout.

UFC 194 takes place Dec. 12 at MGM Grand Garden Arena in Las Vegas. The main card airs on pay-per-view following prelims on FOX Sports 1 and UFC Fight Pass.

The card is so deep that many familiar names, including Torres, are slated for the prelims.

Waterson recently moved up to 115 pounds for her UFC debut. The 29-year-old Team Jackson-Winkeljohn fighter earned a submission victory over Angela Magana in May and is now 7-1 over her past eight fights. However, she’ll have to wait a bit longer to try to get her second UFC win.

Torres, a fellow Invicta FC vet, joined the UFC after a quarterfinal-round finish on “The Ultimate Fighter 18.” In her official UFC debut on the undercard of the show’s live finale, the 26-year-old American Top Team fighter earned a decision win over Magana. She then followed it up with a decision victory over Angela Hill in June to keep her official undefeated pro record intact.

The full UFC 194 lineup now includes:

MAIN CARD (Pay-per-view, 10 p.m. ET)

Champ Jose Aldo vs. Conor McGregor – for featherweight title Champ Chris Weidman vs. Luke Rockhold – for middleweight title Yoel Romero vs. Ronaldo Souza Demian Maia vs. Gunnar Nelson Max Holloway vs. Jeremy Stephens

PRELIMINARY CARD (FOX Sports 1, 8 p.m. ET)

Urijah Faber vs. Frankie Saenz Tecia Torres vs. TBA Warlley Alves vs. Colby Covington Kevin Lee vs. Leonardo Santos

PRELIMINARY CARD (UFC Fight Pass, 7 p.m. ET)

Magomed Mustafaev vs. Joe Proctor John Makdessi vs. Yancy Medeiros Marcio Alexandre Jr. vs. Court McGee

For more on UFC 194, check out the UFC Rumors section of the site.