Valdez cleared waivers and was outrighted to Triple-A Tacoma on Monday.
Valdez lost his spot on Seattle's 40-man roster Friday, but he'll remain in the organization after going unclaimed on waivers. The right-hander made 13 appearances for the Red Sox earlier this year and posted a 4.41 ERA and 1.16 WHIP in 16.1 innings.
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