Staumont landed on the 10-day injured list Friday with a sprained left knee.

The transaction was backdated to Thursday, so Staumont will be eligible to return June 6, though it's not yet clear whether he'll be able to do so. He's been the Royals primary ninth-inning option this season, recording five of the team's 12 saves. Greg Holland and Kyle Zimmer are tied for second with two apiece and could be the primary beneficiaries of Staumont's absence.

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