Robinson (concussion) has been ruled out ahead of Sunday's game against the 49ers, Travis Wingfield of the Dolphins' official site reports.
Robinson likely suffered his concussion in last Sunday's loss to the Raiders. The third-year defensive end out of Penn State will not clear the NFL's concussion protocol in time for next Sunday's game against the 49ers, leaving him to look toward a Week 3 return when the Dolphins will take on the Chiefs.