An MRI confirmed Miami Dolphins linebacker Raekwon McMillan suffered a torn ACL in Thursday’s preseason game, a source told NFL Network’s Ian Rapoport.

McMillan, the Dolphins’ second-round pick this spring, will presumably miss his entire rookie season.

McMillan was in the midst of an impressive camp and was slated to start at strong-side linebacker.

It’s unclear how the Dolphins will proceed at the position now. The team is perilously thin on the depth chart after Kiko Alonso and Lawrence Timmons and may look to trade for reinforcements.

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