Alex Mascarenas sidelined by concussion

Safety Alex Mascarenas left UCLA's football practice Wednesday afternoon because of a concussion and will be out indefinitely as he goes through the concussion protocol.

Mascarenas (5-10, 191), a sophomore, was hurt when he hit Cory Harkey during a team drill. His injury leaves the injury-depleted Bruins secondary even thinner.

Safeties Tony Dye (groin) and Tevin McDonald (ankle) have missed the last few days of practice. Cornerback Jamie Graham had surgery Wednesday to repair a torn meniscus and cornerback Anthony Jefferson had back surgery last month.

"We’ve got a lot of guys down," coach Rick Neuheisel said.

Early in camp, it looked as if safety would be one of UCLA's deepest positions, but now, Dietrich Riley, Dalton Hilliard, Stan McKay and freshman Anthony Thompson are the only healthy scholarship players at the position and may be the only ones available for Saturday's scrimmage. Only Riley and Hilliard have any playing experience at the position.

Defensive coordinator Joe Tresey says he is thankful that most of the injuries are not of the season-ending variety.

"Boy it got thin in a hurry," Tresey said. "But it's camp. It happens. As long as they’re not serious and you have the potential to get them back in a week, you’re OK at this point. Starting Monday, you don’t want that to happen. Right now you can take it knowing that they’ll get good rehab and they’ll get them back and going."

There is no set timetable for any of the injured players to return. McDonald tried to practice Wednesday morning, but "wasn't quite 100 percent," Neuheisel said. Dye hasn't dressed for practice since last Thursday and spent most of Wednseday riding a stationary bike.

"Hopefully we’ll get those guys back and healthy and get where we need to be," Neuheisel said.

In other injury news, reserve tight end John Young sat out Wednesday afternoon's practice because of a pulled hamstring. Offensive lineman Albert Cid missed more than half of practice because he had to deal with NCAA paperwork regarding his transfer from Citrus College. He resumed his role with the first team when he returned.