Morrow sustained the injury during the seventh inning of a 4-1 victory over the Orioles, and things originally appeared much worse. The right-hander was struck by a line drive off the bat of Wilson Betemit, and his right foot immediately went numb.
He feared the worst, that his leg might have been broken, but X-rays came back negative, and he is listed as day to day.
"It hurt a lot, my foot was numb, and then it felt like it was swelling up," said Morrow, who allowed just one run in 6 1/3 innings and earned the win. "I guess there's a nerve in there that it hit or something, but luckily it hit the muscle on the side of my shin. An inch or an inch and a half over, and it could have been a different story."
Morrow isn't scheduled to pitch again until Wednesday because of a pair of looming off-days. The extra rest normally would be a nuisance for a pitcher looking to stay on a regular schedule, but in this case the added time should be enough to prevent Morrow from missing an outing.
"[I] just got done icing it, and it's feeling OK now," he said. "The more I walk on it, the better it feels.
"I'm standing and moving around on it OK. [It's] just a bruise, so we'll just keep working on it and should be all right. Those two days off in between helps out a lot."