in their UFC women's bantamweight championship bout during the UFC 193 event at Etihad Stadium on November 15, 2015 in Melbourne, Australia.

Holly Holm has gone from on top of the world to an uncertain future

Holly Holm, who knocked off previously undefeated Rhonda Rousey last year, has an uncertain future.

As if losing her second straight fight wasn't enough, Holly Holm has suffered another setback in her quest to return to the top.

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Holm, who earned the belt in the UFC women's bantamweight division with a knockout against Ronda Rousey last year, has undergone surgery to repair a broken thumb.

Holm's left thumb was shattered during a loss to Valentia Shevchenko last month. Larry Fresques, who is Holm's manager, told ESPN the fighter had eight pins inserted into her hand earlier this week. It's uncertain when she'll be ready to fight again.

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"We'd still like to fight by the end of the year," Fresques said. "As far as an opponent, we'll have to see who comes up. Whoever she fights, Holly needs to take care of business."

Holm lost her title belt earlier this year in a fight against Miesha Tate. Fans have been clamoring for a rematch against Rousey, but we'll have to wait and see if it happens after Holm's recent setbacks.

Holly Holm (left) kicks Miesha Tate takes during UFC 196 at the MGM Grand Garden Arena on March 5, 2016 in Las Vegas, Nevada. (Photo by Rey Del Rio/Getty Images)

Holly Holm (left) kicks Miesha Tate on March 5, 2016 in Las Vegas, Nevada. (Photo by Rey Del Rio/Getty Images)