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Polanco (hamstring) has been ramping up baseball activities but will require a minor-league rehab assignment before activation, MLB.com reports.

The veteran infielder took full infield practice during the Mariners' three-game road trip in Oakland earlier in the week, and there were no reported setbacks. However, manager Scott Servais confirmed before Friday's series opener against the Royals that Polanco will require at least a brief rehab assignment, which could commence at Triple-A Tacoma in the coming days.

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