Texas Rangers right-hander Yu Darvish suffered tightness in his right quadriceps muscle during a bullpen session Tuesday afternoon.
He is still scheduled to start Thursday against Minnesota, but will be examined on Wednesday.
"Not an issue," manager Ron Washington said. "We've got to wait until tomorrow to see how he gets through it."
Darvish is 12-9 with a 4.51 ERA.
-- Drew Davison