Woo was removed from Monday's game against the Rays due to right hamstring tightness.
Woo left his start with the team trainer after suffering what looked to be a right leg injury, and he's since been diagnosed with a hamstring issue. The team should have a better idea of whether he'll require a trip to the injured list after further evaluation, and he's set to undergo an MRI on Tuesday, per Daniel Kramer of MLB.com.
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Mariners' Bryan Woo: Lands on IL with strained hamstring
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