Whether that happens or not is manager Buck Showalter's decision, and Matusz's fate could depend on whether fellow rookie starter Jake Arrieta -- who is 22 2/3 innings over his career high -- gets another outing.
Matusz did some long toss with Jeremy Guthrie prior to Wednesday's game and Showalter said the team would try to get a feel for where he's at physically before determining next week's rotation at Fenway Park.
Matusz said the swelling is gone in his left triceps and he is essentially dealing with just a bruise as the remnants of Yunel Escobar's first-inning comebacker, which forced him to exit the game after recording three outs.
"I felt good and that's the most important thing," said Matusz, who took Wednesday off. "I'll get back on my current routine."
That includes Friday's bullpen session, which should give the Orioles a better idea of where Matusz is at. Like several of the O's young arms, the 23-year-old Matusz's workload will be carefully watched in the final weeks of the season. Matusz is at 157 2/3 innings, matching his combined total from three levels last season, and neither Showalter or Matusz anticipate his injury will hinder him going beyond that total.