Cannonier revealed this during a post on Instagram:
That didn’t go exactly how I wanted but My spirits remain high and I’m happy with how I fought all things considered. The very first kick he threw broke or fractured my left ulna -- I couldn’t find my grove and adjust quickly to get the W so I’ll take my L with pride. @robwhittakermma certainly lived up to my expectations before and after the fight. Congrats mate. Enjoy Xmas and the new ----. It was a hell of an experience to be here. Can’t wait to go again.
There is no word at this time as to how long Cannonier will be out of action for, but more should be known as the injury heals up.
Take a look at Cannonier's broken arm below.