Frelick will undergo an arthrogram Tuesday to get a diagnosis on his injured right shoulder, Jack Stern of BrewerFanatic.com reports.
Frelick landed on the 10-day injured list this past weekend with what the Brewers described as a shoulder strain, but the club hopes the arthrogram will provide a more specific diagnosis. Once the results of the exam are in, more will be known about a timeline for Frelick to return to the active roster.