Justin Verlander wasn’t on the mound for long Monday night. (Justin K. Aller /Getty Images)

After making the earliest exit of his nine-year career, Detroit Tigers ace Justin Verlander will undergo an MRI to determine just what is going in his shoulder.

Verlander, whose team fell from first place in the American League Central, said something “has been lingering for a while” and tweeted an update shortly before 8 o’clock Monday morning:

Verlander has never missed a start because of health problem, so it was concerning to see him leave the game against the Pirates in Pittsburgh after one inning in which he gave up five runs. The team listed the cause as “right shoulder soreness,” and Verlander indicated he’s been gutting this out.

“I’d be lying if I said I wasn’t a little nervous,” Verlander said (via Freep.com). “I’ve never been through this before.”

Verlander hurt himself while going through his offseason conditioning program and underwent surgery to repair his core muscles over the winter. Two months ago he reworked his mechanics. He wasn’t certain whether either was a contributing factor.

“That’s a good question, especially regarding the surgery,” he said. “Maybe that can cause some extra soreness or maybe throw you out of whack a little bit. It’s all speculation, really, though.”

Verlander, the 2011 AL Cy Young winner, is 10-11 with a 4.76 ERA this season.