Chase, a two-star defensive end from Concord, will not be a member of SDSU's football team this year, Long said on Tuesday night.
"He decided not to come," Long said. "He decided he didn't want to play football anymore."
Other than those five, Long said the rest of the 2011 signing class is healthy and at camp.
Gibbs back in a boot
Defensive lineman Larry Gibbs was listed as the starting defensive end on the updated depth chart, but he'll likely have to wait a while before he can fulfill that starting role.
Gibbs is back in a boot after breaking his foot earlier this year. Long said he injured it, had an operation and was supposed to be back 100 percent by the time camp opened yesterday. But that wasn't the case when doctors reevaluated him earlier this week.
"He hasn't been cleared to practice," Long said. "They put him back in a boot and they think he's going to be in a boot for another couple weeks. So he's not going to practice for another couple weeks."
Muema battling illness
Running back Adam Muema is supposed to be the thunder to Ronnie Hillman's lightning this season. But Muema will have to wait a few days to show his power on the field.
Long said Muema is battling an illness and is being held out of practice because of it.
"It's supposed to be nothing big," Long said.
Lindley changing it up
Senior quarterback Ryan Lindley looked a little different during practice this week, and it wasn't just his shaved head and face.
Lindley was sporting a new helmet for the first time since high school.
"The old one became obsolete," he said. "So our equipment guy basically told me they've done some studies and said it's somewhat of a concussion box. Trust me, I was a little bit against it, I'm kind of old school. But it's a safety issue."
Lindley said style-wise, the older one was better.
"(The new one) is kind of too much," he said laughing.
Lindley is also sporting a new bulky knee brace, but is wearing it for precautionary reasons in case a player falls into his plant leg.
Long said the Aztecs will practice in shoulder pads and helmets on Wednesday and Thursday and then will go full pads on Friday. The first 30 minutes of Wednesday's practice will be open to the media.