Martin's exit could have the greatest impact on a team thin in experienced linemen, especially centers. Cyrus Hobbi, whose lone start came against Stanford in 2012, has had back problems. Max Tuerk, a starter the last two seasons at tackle and guard, worked at center last spring. The Trojans might rely on Toa Lobendahn, a highly regarded prospect who played at Lakewood and La Habra high schools and was among the players who enrolled this week.
Grimble passed up a chance to play in an offense that helped Washington's Austin Seferian-Jenkins win the Mackey Award as college football's top tight end.
Grimble's departure leaves the Trojans with two scholarship tight ends. Senior Randall Telfer struggled through knee and ankle injuries last season and caught only six passes. Junior Jalen Cope-Fitzpatrick has mainly been deployed as a blocker. Walk-on Chris Wilson also contributed, and the Trojans received an oral commitment from Bryce Dixon, a 6-foot-4, 230-pound tight end from Ventura St. Bonaventure High.
Bailey's departure should be eased by experience at safety. Su'a Cravens started as a freshman, Leon McQuay III received significant playing time and Shaw also has started games at the spot.
Uko's position could be filled by Delvon Simmons, a 6-6, 300-pound transfer from Texas Tech who redshirted last season. Kenny Bigelow, a 6-3, 300-pound redshirt freshman, also is ready to play.
Offensive lineman Jordan Austin, defensive lineman/linebacker Don Hill and quarterback Jalen Greene joined Lobendahn as early enrollees who will participate in spring practice. Defensive lineman Claude Pelon, a junior college transfer, is not yet in school, but Sarkisian said he could be by the end of the week.
Sarkisian reiterated that depth issues will not be used as an excuse as the Trojans prepare for and play the 2014 season.
"We've got a plenty-talented enough roster to go out and compete for a championship," he said. "That's what I said on day one and I really am not wavering off that."