USC will have two all-conference players back for the 2018 season.
Smith, a team captain in 2017, has started three seasons for the Trojans and earned first-team All-Pac-12 honors this past year. ESPN's Mel Kiper lists Smith as the No. 5 draft-eligible inside linebacker.
Lobendahn, a second-team All-Pac-12 selection in 2017, has played multiple offensive line positions during his first three seasons and could occupy the center spot this fall. He will be a fifth-year senior in 2018.