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Haggerty is currently dealing with a head injury and he could be placed on the seven-day concussion list, Daniel Kramer of MLB.com reports.

Haggerty is out of the lineup for Saturday's contest against the Rockies, but he likely would have been out anyway with a right-hander on the mound for Colorado in Ryan Feltner. The Mariners selected the contract of Jose Caballero to provide some depth in the infield. Haggerty has been playing everyday against southpaws, but even if healthy, he risks losing playing time when Dylan Moore (oblique) comes off the injured list to fill a similar role.

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