Burr was removed from Thursday's appearance versus the Rays with tightness in the back of his right shoulder, Corey Seidman of NBC Sports Philadelphia reports.
Burr induced a groundout and a strikeout but then allowed a single to the third batter he faced before being lifted. The right-handed reliever will likely have tests done on the shoulder. Burr is in camp with the Phillies as a non-roster invitee.