Roberts unsure of Reading return
He has been struggling with a hip injury and has not played since Royals' 1-0 defeat to Southampton on December 8.
"It's going slowly with the hip and there is no real time line on it," said the 35-year-old to the Reading Post.
"I'll keep working on the training ground to get it right. It's not cut and dry, that's the nature of the injury. We're working as hard as we can to try and get it right.
"We've exhausted everything we can to try and make it right. If there is an opportunity of us managing it, then we certainly will do."