Manager Buck Showalter said the medical staff is also leaning toward giving Wolf a cortisone shot, which would shut him down for a few days, but that likely won't be determined until after he gets the MRI.
"I'm hoping if he gets the injection he's done for a couple days, which he would have been anyways pitching on Saturday," Showalter said. "So, hopefully he will be available to us Friday after the off-day."
Signed as a free agent after being released by Milwaukee, Wolf made his second start for the Orioles on Saturday, pitching five innings and allowing three earned runs on seven hits and two walks against the Red Sox. He is a combined 5-10 with a 5.65 ERA in 30 games (26 starts) this season.