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Castillo was placed on the 15-day injured list Tuesday due to a Grade 2 left hamstring strain, Ryan Divish of The Seattle Times reports.

The right-hander already received a platelet-rich-plasma injection and hopes to be available after spending the 15-day minimum on the shelf. Even in a best-case scenario, Castillo will only be able to rejoin the Mariners for one or maybe two starts before the end of the regular season. Seattle is currently three games back of the final AL wild-card spot and is tied with two other teams, and the playoff positioning could affect how quickly the organization elects to bring Castillo back.

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