According to Rangers GM Glen Sather, while it's possible that Marc Staal has a concussion, that might not be the reason for his headaches. "We think we've got a handle on it now so we're going to know in the next couple of days exactly," Sather said. "I'm saying is I'm not exactly sure. I've heard that it may not be (a concussion) but it's such a fine area of trying to define what's causing the problem." Staal had a concussion in February and he won't fly with the Rangers to Europe on Monday due to his headaches. However, Sather said it's possible that Staal is dealing with a slipped disc or migraines. He's also left the door open for Staal to meet up with his teammates in Europe on Wednesday or Thursday. Stay tuned.