Bruce Walton, the Jays picthing coach, was on the radio earlier today talking about how this was only precautionary and that he should miss only a start. But I don't think they really know it for sure.
On related news, Jo Jo Reyes will take Morrow's spot in the rotation. They will open the season with Romero, Drabek, Cecil, Litsch and Reyes. I have always been a fan of Jo Jo and I think he still has upside.