Burr (shoulder) struck out two and worked around two hits to turn in a scoreless inning of relief Saturday in Triple-A Lehigh Valley's 5-4 win over Rochester.

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 signed a minor-league contract with the Phillies on Dec. 12.

Burr was placed on unconditional release waivers by the White Sox on Monday.

Burr was optioned to Triple-A Charlotte on Friday, LaMond Pope of the Chicago Tribune reports.

Burr (shoulder) was reinstated from the 10-day injured list Friday.

Burr was recalled from Triple-A Charlotte on Friday.

Burr was optioned to Triple-A Charlotte on Tuesday.

The White Sox recalled Burr from Triple-A Charlotte on Monday.

Burr (2-0) allowed two runs on three hits while striking out one but got the win over the Twins on Tuesday.