The Pittsburgh Pirates don’t know the severity of JT Brubaker’s arm injury except that it’s serious enough to keep him out of the starting rotation for the next two months.

The 29-year-old right-hander, who left spring training with right elbow/forearm discomfort, was moved from the 15-day injured list to the 60-day IL Sunday afternoon to clear room on the 40-man roster after the Pirates claimed right-handed reliever Edwin Uceta off waivers.

“We still haven’t determined where it’s at. It is in the arm,” Pirates manager Derek Shelton said on the AT&T SportsNet postgame show after Sunday’s 3-1 loss to the Cincinnati Reds. “As we have more information, we’ll be able to get it. We knew it was going to be a longer length of time. We’re still finding out information and probably should have more information next week.”

Where Brubaker was one of the Pirates’ returning starters, Shelton said right-hander Johan Oviedo will take his spot in the rotation. Oviedo is scheduled to start Monday when the Pirates visit the Boston Red Sox at Fenway Park.