"A bit of bone has broken off the back of my ankle and stuck out about an inch," he has said.
"Every time I bend it is causing a bit of pain so I have had an injection to clear it up for a while.
"It should be okay to the end of the season but the plan is to get me through to the summer and then do something then.
"I have had it for a couple of years now and the build-up of fluid and other medical things the doctors know more about than me has been constantly aggravating it," he said.
"Striking a ball or bending the ankle in a flexed position or pushing off it hurts. It got to the point where it was too sore to train and play. Something had to be done and I had the injection."