Maybe Bill Walker will contribute this year

Boston Herald
Mere days after having the fourth knee surgery of his young life, the 21-year-old  Celtics forward said yesterday that the recovery process “is going to be one of the easiest rehabs I’ve had. Of all my injuries, this is going to be the easiest one.”
Doctors have told Walker, who turns 22 on Friday, that recovery will take 6-8 weeks, but Walker has a shorter period in mind until his return to the court. “Four weeks,” he said, jaw set, during a visit to the team’s Waltham practice facility for treatment.

Just between me and you if the Celtics are going to have a guy on the team with constant knee problems I'd rather have it be Leon, but I guess that ship has sailed. Here's hoping Walker can return in 4, 6, 8 weeks whatever and force Doc to give him some minutes  at the back-up 3, keeping Paul a little fresher.