Gokhan Saki seems to have a very real reason why he can’t fight next month. A training injury landed him in the hospital, Saki wrote Wednesday on Instagram.

On Tuesday, it was announced that Saki was out of his fight with Khalil Rountree at UFC 219 on Dec. 30 in Las Vegas. The former world champion kickboxer explained the situation in his social media post, complete with a picture of him in a hospital bed.

“I wanted to announce this myself but i needed some time to recover mentally from this bad news,” Saki wrote. “I got injured during a training and went to the hospital for this.”

Initially, Saki said he wanted to gut through the injury and fight, but was advised against it.

“My team and management took the decision with the medical team that i needed treatment and i have to think of my health first,” he wrote. “I didn’t want to accept this but i’m glad i have the right people around me. It felt like i let my fans and supporters down, i was really looking forward to this fight. So the bad news was a bitter pil to swallow. But this is top sports and injuries are unfortunately a part of it. I’m recovering now and will be back in training soon.”

Saki (1-1) did not say what the exact injury was or how long he’ll be out of action.

The Netherlands native of Turkish descent made his UFC debut in September, knocking out Luis Henrique da Silva in the first round at UFC Japan. Saki, 34, won a $50,000 Performance of the Night bonus for his effort and earned a boatload of new fans in the process due to his exciting, striking-based fighting style.

Rountree will now meet Michal Oleksiejczuk at UFC 219.