The Colorado football team learned Tuesday it has lost two more players for the season because of injuries and another player is making a position change to help compensate.
Safety Anthony Perkins is out for the season after suffering a torn anterior cruciate ligament during last week's loss at Missouri.
"He's a warrior," coach Dan Hawkins said. "We'll miss him physically and emotionally."
Running back Brian Lockridge also is out for the season. He will undergo surgery to repair an undisclosed injury in his ankle.
Hawkins said sophomore wide receiver Will Jefferson will move to tailback to help fill the void from Lockridge's injury. Hawkins said Jefferson could play as soon as this Saturday at home against Baylor.
Jefferson played running back in high school. Hawkins said freshman Tony Jones will serve as the emergency running back.
"There won't be any slow up at all," Jefferson said. "I've played running back my entire life."
First-year secondary coach Ashley Ambrose is getting an education in managing his corps of players and navigating through injuries. Perkins is the fifth member of the secondary to suffer a serious injury this fall.
Vince Ewing and Parker Orms are out for the season with torn anterior cruciate ligaments and Travis Sandersfeld and Paul Vigo have missed significant time with lower leg fractures. Both are expected to return in the coming weeks.
Ambrose said redshirt freshman Deji Olatoye and true freshmen Terrel Smith and Jered Bell are competing for Perkins' starting job this week in practice. Ambrose said coaches would choose one of the players later in the week. Ambrose said it's possible Arthur Jaffee could compete for the position as well.
"You know, the first thing I thought about was why it had to happen to this group," Ambrose said. "You know, things happen for a reason and I was wondering is it me? Is it something I'm doing? You can't help it. That's just the nature of this game, and unfortunately it has been (defensive backs)."