Nall is one of four players Packers coach Mike Sherman listed as out for the game. The others are defensive ends Chukie Nwokorie (hamstring) and Ja'Dae McGuire (abdomen) and rookie defensive tackle Donnell Washington (arch). Linebacker Tyreo Harrison (ankle) is doubtful.
Nall returned to practice Wednesday but took part in only a limited number of snaps the rest of the week, in individual and 7-on-7 drills in which there is no pass rush to force him to run from the pocket.
Even though time is running short, with veteran Doug Pederson putting together his usual solid training camp, Nall says there's time to prove his worth to Sherman and Co.
"I don't think it's a make-it-or-break-it situation yet," Nall said. "I think Coach Sherman might be reluctant to put me in (Monday) because I haven't practiced a whole lot.
"I know I'm going to have to take it a little at a time and try not to rush things. That's a mistake I've done in the past, and I know it doesn't work."
After missing practice Wednesday and Thursday due to a sore foot caused by wearing too small a pair of shoes before the Saturday Family Night Scrimmage, star running back Ahman Green returned to practice Friday.
"I thought he looked like himself," Sherman said. "It seemed like he was rested. The foot didn't appear to be sore."
Now, for the daily dose of bad news. The Packers lost a pair of reserve defenders in the space of a few minutes during the Friday morning session. Linebacker Marcus Wilkins came away with a concussion as he tried to tackle Green. Just a couple of snaps later, safety Curtis Fuller strained his back while chasing running back Najeh Davenport.
"I believe both will be OK, (but) I don't know about (their status for) Monday," Sherman said.
Speaking of back pain, starting weak-side linebacker Na'il Diggs missed practice for the second straight day. Sherman said Diggs went to a chiropractor on Thursday. Cornerbacks Al Harris (sore hip) and Joey Thomas (bruised knee) were out, as was rookie center Scott Wells (biceps tendinitis).
Ongoing injuries include center Mike Flanagan (knee), left guard Mike Wahle (knee), offensive tackle Brennan Curtin (staph infection), tight end David Martin (knee) and cornerbacks Chris Watson (hamstring) and Chris Johnson (leg).
Flanagan isn't sweating the tendinitis in the knee that has kept him out of all of training camp. He will not play Monday against Seattle, but he vows to play in the Monday night regular-season opener against Carolina.
"If there's a game this weekend, I'm playing," Flanagan told the Milwaukee Journal Sentinel. "I'm not worried, I swear to God."