So tweets Larry Brooks, Andrew Gross, etc.
From Andrew Gross:
However, enforcer Derek Boogaard’s eventual return is also on hold. Boogaard has missed five games with what started as a strained right shoulder. However, coach John Tortorella said today Boogaard has been experiencing headaches so the Rangers have shut him down from exercising and will most likely (make that almost certainly) have him tested for a concussion. It goes without saying that until the headaches cease, he will not be allowed to practice/skate/workout.
Link to his updated blog here.
Larry Brooks' tweet:
NYP_Brooksie Larry Brooks
Boogaard experiencing headaches, may have concussion in aftermath of Dec. 9 fight in Ottawa v. Carkner.