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Castillo is expected to work as the primary reliever Tuesday against the White Sox, Adam Jude of The Seattle Times reports.

Bryce Miller will draw the start and will likely work as long as he's effective, and then it'll be up to Castillo to take the mound. This will mark the right-hander's first relief appearance of his MLB career. It remains to be seen whether Castillo will remain in the bullpen going forward, but for the time being, it appears he's the odd man out of the starting rotation following Miller's return from the injured list.

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