"There's been days where I felt like I was ready for a game, and then two days later, it wouldn't feel nearly as well," said O'Day, who last appeared in a game on June 1. "It's tough. It's right on the bone. There's not a ton of blood supply, as far as I understand, so it takes a while to scar down and re-attach. And the way I pitch, I stress that area quite a bit. So, don't want to be dealing with it all season. We are just trying to get it right. "
O'Day said he wasn't sure when he would throw next but did confirm that he would take at least one more bullpen session before any kind of sim game. Asked if he felt the injury while pitching, O'Day said he sometimes did.
"The only real actives I've done so far are pitching and a little bit of running," said O'Day. "Pitching is, it elongates the muscle there, so that produces it sometimes."
Brittany Ghiroli has covered the Orioles for MLB.com since 2010. Read her blog, Britt's Bird Watch, follow her on Facebook and Twitter @britt_ghiroli, and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.