Jack Jenkins had an even worse weekend than it seemed.

On Saturday, Jenkins squared off with Gabriel Santos on the prelims of UFC 312. In the opening round, Jenkins had a lot of success, even dropping Santos with a kick, but the Brazilian later took control of the bout and ended up finishing Jenkins with a rear-naked choke in the third round. And that was just the beginning of Jenkins’s bad night.

Australian MMA was the first to report the news.

MMA Fighting confirmed with sources close to the situation that following the bout, Jenkins was taken to the hospital for post-fight medicals and discharged. However, he was later readmitted after the medical team discovered fractured cartilage in his thyroid. Jenkins was held under medical supervision for the weekend and released from the intensive care unit Monday.

Jenkins’ team believes the injury occurred at the end of the first round, as “Phar” told his corner he had numbness and loss of strength in his left arm.

The loss dropped Jenkins to 3-2 in the UFC, with a record of 13-4 overall.

Damon Martin contributed to this report.