Corey Kluber's debut for the Texas Rangers lasted just one inning on Sunday.
The right-hander threw just 18 pitches before departing his first start in almost 15 months with shoulder tightness.
Texas acquired Kluber in a trade with Cleveland this offseason. The 34-year-old was knocked out of his last start for the Indians on May 1, 2019, when his right forearm was broken by a comeback liner.
"He is a tough guy and has pitched a lot of innings in the majors," Chris Woodward said. "When he says something is related to his arm, we are concerned. Hopefully he comes in tomorrow and feels a little better, but we'll see."