UCLA defensive end Owamagbe Odighizuwa is delaying his junior season in 2013 to recover from right hip surgery.
The Los Angeles Times first reported the surgery would result in a medical redshirt year.
Several injuries on the defensive line could spark a scheme adjustment by coach Jim Mora Jr.
Odighizuwa was the leading candidate to replace first-round draft pick Datone Jones in the Bruins' defense and depth at the position is considered shallow.
Odighizuwa posted 3.5 sacks and two fumble recoveries as a sophomore.