The Jets moved Baron (knee) to the reserve/PUP list Sunday, Eric Allen and Amanda Vogt of the team's official site report.
Baron opened training camp on the active/PUP list due to a knee injury he sustained last December. He's not quite ready to participate in practice, and the move to reserve/PUP means he'll be required to miss at least the first four games of the regular season. The second-year pro logged nine tackles (five solo) across six regular-season games last year before his knee injury.