The converted defensive end was a long shot from the start to make the roster, but at 6-foot-9, 277 pounds, he displayed some intriguing qualities.
Villanueva spent the last four years as an active member of the Army, serving three tours in Afghanistan. He last played football in 2009 at the U.S. Military Academy, where he was West Point's top wide receiver as a senior. He also took snaps at left guard, tight end and defensive end in his four years of college football.
Coach Chip Kelly said he made the cuts early on Saturday to give players a chance to latch on elsewhere and to free up practice time for players with a shot at making the team.
None of the nine Oregon Ducks on Kelly's roster were cut in the first rounds, meaning 12 percent of the team is currently made up of players from the coach's former employer.