Keller was removed from Thursday's start against the Mariners with posterior right shoulder discomfort, Anne Rogers of reports.

The right-hander was pulled after 4.1 innings during Thursday's outing when he showed some discomfort on the mound after surrendering a two-run homer to Kyle Seager. Keller didn't end up factoring in the decision and gave up two runs on five hits with four walks and three strikeouts. It's unclear if the injury will affect his next turn through the rotation.

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