The Blue Jays are awaiting the results of an MRI performed on the pitcher's throwing shoulder after sharp pain brought an abrupt end to Monday's throwing session.
McGowan was working through a live throwing session at Toronto's Minor League complex in Dunedin, Fla., but he was forced to cut it short after just eight pitches. The Jays promptly scheduled the MRI to determine the extent of the damage.
At PETCO Park on Tuesday afternoon, manager Cito Gaston noted that McGowan was scheduled to see Steve Mirabello -- one of the team's doctors -- before meeting with renowned arm surgeon Dr. James Andrews.
"He's going to see the best and get his opinion about what might be going on," Gaston said. "Whether it's good or bad, I always look at it as good."
Monday's session marked the first time that McGowan -- sidelined with shoulder woes since 2008 -- was facing hitters since March 19. During Spring Training, the 28-year-old appeared to be making strides in his comeback attempt until laboring through what the Blue Jays described only as a "dead arm" period.
With his last big league appearance coming on July 8, 2008, McGowan hoped to make a push toward Toronto's rotation at some point this season. A first-round pick in the 2000 First-Year Player Draft, McGowan won 12 games for the Jays in 2007 and is 20-22 with a 4.75 ERA in 75 career Major League games.
McGowan was forced to undergo surgery to repair the fraying of the labrum in his right shoulder in July of 2008, and he missed the entire '09 campaign. Complicating matters last year was the fact that in July -- shortly after being cleared to resume playing catch after another shoulder setback -- McGowan required surgery to repair a torn ligament in his left knee.
Jordan Bastian is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.