Favre was scheduled to start for the NFC squad.
"It's documented (by the team's medical staff) that's been getting treatment on his back," Sherman told the Green Bay Press-Gazette. "I don't know how they can make him play."
Favre said he had trouble putting his socks on the next morning after he was sacked twice and threw three interceptions in a loss on Nov. 18 to Atlanta. Four days later, he was sacked twice and slammed to the turf by Lions defensive end Robert Porcher in a Thanksgiving Day win over Detroit. Favre was listed on the team's injury report the rest of the season.
Favre has been selected by players, fans and coaches to the Pro Bowl six times, including four times as the starter.