"Everything felt fine, my arm felt good," Johnson said. "I'll be in there."
Johnson pitched two-thirds of an inning in Thursday's 5-4 win, allowing one run on two hits.
Johnson told manager Dave Trembley prior to Wednesday's game that he had some tightness in his right arm, and he was unavailable out of the bullpen in the team's 4-3 loss.
Johnson first experienced the sensation when throwing the first pitch to Carlos Pena in the eighth inning of Tuesday's game. After consulting with head athletic trainer Richard Bancells, Johnson said the prognosis was a slight muscle strain.
"It's something I haven't really had before," he said. "It's just muscular, nothing with a ligament. The meds and ice worked, [it was] pretty much Advil and ice. So we're good."
Having a healthy Johnson is certainly a sigh of relief for the Orioles. With Koji Uehara on the 15-day disabled list (left hamstring strain) and the shaky performance of closer Mike Gonzalez, who took the blown save in Tuesday's loss and then was forced to work out of a jam on Thursday, Johnson's presence is critical to the O's bullpen.
"J.J.'s fine," Trembley said. "He came in [from throwing] and told me he's ready."