Decker is dealing with an oblique injury, and his timetable for return is currently unclear, Susan Slusser of the San Francisco Chronicle reports.

Decker joined the Athletics' camp as a non-roster invitee who was hoping to crack the major league roster as the team's fifth outfielder. Depending on how serious his oblique injury is, the 27-year-old could be in jeopardy of missing the Opening Day cut.

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