The Steelers placed Kent (undisclosed) on the reserve/PUP list Monday, Teresa Varley of the team's official site reports.
Kent spent all of training camp on the active/PUP list, enabling the cornerback to start the regular season on the reserve/PUP list. The 24-year-old will need to miss at least the first four games of the regular season before he is eligible to return to the active roster.