Packers coach Mike McCarthy was expecting to have all of his players on the field today for the first day of training camp.
That didn't happen because four players -- including two starters -- didn't pass physical tests yesterday.
Pro Bowl receiver Donald Driver sat out because of a lingering shoulder injury from last season.
Rookie running back DeShawn Wynn had what McCarthy said was a stomach virus.
McCarthy accepted those two absences, but he wasn't happy with defensive tackles Ryan Pickett and Johnny Jolly. They were held out because they failed a conditioning test consisting of eight runs across the width of the field.
Also during the practice, tight end Tory Humphrey suffered a potentially serious ankle injury.
McCarthy said it didn't look good, and that Humphrey was in a lot of pain.