Palepoi, 25, served three games of his four-game suspension last season. The league suspended him for violating its performance enhancing drug policy.
He appeared in 13 games last season, with 13 tackles, nine quarterback hits, 20 quarterback pressures and a fumble recovery. Palepoi missed the 2015 season with a broken foot.
Rochell was the Chargers’ seventh-round pick this year. He had one tackle Monday night.