Cooper was placed on the 7-day concussion injured list Friday, Jordan McPherson of the Miami Herald reports.
Cooper last saw game action Tuesday against the Padres when he went 0-for-3 with two strikeouts and a hit by pitch, but it's unclear when exactly he suffered the concussion. The 31-year-old will be eligible to return from the IL next week, though he'll first have to fully clear the concussion protocols.