"I've been injured since May and when you can't do what you're paid to do it's massively frustrating," he told the club's official website.
"I had a lot of expectations surrounding this season and what it might hold for me but I have to put those aside for now.
"When you're told you're going to be out for eight months and no sooner you just have to knuckle down and get on with it.
"Earlier this month, I started doing a few things - just having someone hit volleys into my hands. But I'll start doing some proper sessions soon with the goalkeeper coach and that will push the knee a bit further.
"The aim at the moment is to be doing full training and getting involved with the lads sometime after Christmas - probably early February."