Keller left Thursday's start against the Mariners with an apparent arm injury, Anne Rogers of MLB.com reports.

Keller surrendered a two-run home run to Kyle Seager during the fifth inning and was seen grabbing his right triceps after the pitch. He left the game without facing another batter, though there has been no official diagnosis to this point. Prior to his exit, Keller allowed two earned runs on five hits and four walks while striking out three across 4.1 innings.

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