Dunning is listed as the probable pitcher for Saturday's game against the Mariners.
The Rangers recalled Dunning from Triple-A Round Rock on Friday.
The Rangers optioned Dunning to Triple-A Round Rock on Saturday.
Rangers manager Bruce Bochy said that Dunning was removed from Monday's start against the Pirates because he was displaying diminished velocity and spin on his pitches, Evan Grant of the Dallas Morning News reports.
Dunning will start Monday's contest against the Pirates.
Dunning came away with a no-decision in Wednesday's 9-7 extra-inning win over the Red Sox, giving up four runs on five hits and a walk over five-plus innings. He struck out three.
Dunning will start Wednesday's game in Boston.
Dunning struck out a batter and worked around two hits and one walk over two scoreless innings out of the bullpen in Sunday's 8-7 loss to the Yankees.
Dunning is an option to make a spot start Saturday versus the Red Sox, Shawn McFarland of The Dallas Morning News reports.
Dunning allowed two runs on five hits and two walks while striking out two over three relief innings in Saturday's 7-3 loss to Toronto.