The Scotland international damaged ligaments in September but after undergoing surgery is looking to be back in action for the Whites in a month or so once he steps up his recovery.
"He's doing light training and I think they're going to push him on a little bit next week," said Warnock.
"But I don't think it's right to push him too much when we've waited all this time.
"I can't see him playing for another three weeks, other than a reserve match or practice game. You know what Ross is like anyhow, but you're talking about September when he last played."