Tight end Donald Lee strained his back during Tuesday's morning practice and attempted to practice during the evening session before dropping out.
"He fought through practice and tried to go again (in the evening), so I actually sent him back up (to the locker room)," said Packers coach Mike McCarthy.
Offensive lineman Tony Palmer did not practice on Tuesday to rest a slight hamstring injury that he sustained during last Saturday's preseason game at Pittsburgh.
Both Palmer and Lee are expected to return to practices Thursday. The Packers do not practice today.
Other players who have not been able to practice this week include: Offensive lineman Orrin Thompson (knee); fullback Brandon Miree (stinger); running backs Vernand Morency (knee), P.J. Pope (knee), and DeShawn Wynn (quadriceps); and defensive end DeVon Hicks (groin).
Thompson, Miree, and Wynn may be ready to practice on Thursday.