Barnette had an MRI on Wednesday, though the team didn't immediately reveal or know the results of the exam.
Working the eighth inning in a 5-3 loss to the Houston Astros on Tuesday night, his second inning of the game, Barnette felt something different in his shoulder on his first pitch to Marwin Gonzalez. Barnette (2-0) threw two more pitches before exiting the game.
Texas recalled right-hander Chris Martin from Triple-A Round Rock. Martin was optioned to the minors on Tuesday, but was able to come back before 10 days by replacing a player on the DL.