Ronda Rousey: Defeated UFC champion assures fans she's fine

Ronda Rousey (right) was the first American woman to win an Olympic judo medal - at the Beijing Games in 2008

Ronda Rousey has assured fans that she is fine after suffering a knockout defeat in her Ultimate Fighting Championship bantamweight title fight against Holly Holm.

Rousey was floored by a head kick in the second round of the fight in Melbourne.

She wrote on social media: "I appreciate the concerns about my health but I'm fine.

"I'm going to take a little bit of time but I'll be back."

Rousey, 28, required medical attention after her defeat - her first in 13 bouts in the sport.

Holm remains undefeated in UFC, with a record of 10-0.