He will be evaluated again Wednesday in another blow to a team that has lost five straight to fall a season-worst five games below .500. The Rangers and Royals next play Wednesday at 8:15 p.m. ET on ESPN+.
Also, Rangers left-hander Cole Ragans, the team's first-round pick in the 2016 draft, will need a second Tommy John surgery after tearing his ulnar collateral ligament. The 21-year-old Ragans was close to pitching in a game for the first time since his last surgery when he began feeling discomfort about a week ago.
"It's obviously concerning,'' Rangers general manager Jon Daniels said, adding that the surgery will be Wednesday. "This is the first Tommy John surgery we've had that's failed.''
The Associated Press contributed to this report.