Wood, who is out of Minor League options, was a strong candidate to make the bullpen out of camp, as he had been pitching well since struggling against the Rays on March 5. Wood has a 4.91 ERA with 10 strikeouts in 11 innings this spring, but his ERA over his last five outings (6 1/3 innings) is 1.42.
Ryan said the Twins will wait to decide whether to place Wood on the 15-day disabled list, because the club wants to assess the seriousness of the injury first.
"We'll see how it goes," Ryan said. "He doesn't feel right, so we're going to have to take care of it. I don't think it's an MRI situation. He just doesn't feel right. I don't know if it'll be a week or a month or what it'll be. We'll see. It could just be discomfort."
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.