The Texas Rangers announced Wednesday that lefty Cole Hamels has been placed on the 10-day disabled list with a strained right oblique muscle.
Hamels is expected to be out of action for eight weeks.
The 33-year-old was scratched from his Tuesday start against the Houston Astros when he felt tightness while he was warming up in the bullpen before the start of the game.
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He will join the team in Seattle and continue his treatment.
This just the fifth time Hamels has been placed on the disabled list in his career.
Hamels is 2-0 on the season for the Rangers.
Anthony Bass has been recalled from Triple-A Round Rock and will replace Hamels on the roster.