"That's the odd part of the injury," Jenks said on Sunday. "They say it can't get any worse. It's like you have a sore arm and you're working through it."
Jenks said he is OK when he is throwing the ball, but he feels some discomfort when he tries to pivot after delivering a pitch in order to field a ground ball or cover first base.
"I irritated it the day I was supposed to throw," Jenks said. "As for the results of the MRI, it turns out it's a good report. There is some irritation in there but it's not structural damage."
Jenks will continue to take treatment from the White Sox medical staff and then try to throw a side session on Monday morning.
Jenks, kidding around on Sunday, said he has the record for the highest spring training ERA -- 37.80, thanks to seven earned runs in 1 2/3 innings -- and he doesn't want that record messed with.
Bruce Levine covers baseball for ESPNChicago.com.