see below
To second Foxy, he is planning to be back for the Coventry game in April. I read in the Green Un that he had injured his knee and would be out for a little longer. He was keen to point out that it wasn't a recurrance of the crucitae damage he did, but a different injury 9albeit on the same knee!?).
Personally I've given up hope of Naysmith. He was a very good defender last year, but I can't see him having much more of a Sheffield United career. He's the last of the big earners from the Robson era and I think Blackwell will be looking to shift him because of this. Additionally there is the match fitness issue. Even if he was to come back next month then he is likely to be off the pace. He'll need games to get him up to match fitness.
Maybe he is an option for next season. He is only 31 (so not that old) and seems determined to carry on playing. However I wouldn't be surprised if we let him go on a free over the summer. I suspect he may go back over the border to finish his career. Does anyone know how long he has left on his contract?