Walker is scheduled to undergo an MRI exam on Monday in Green Bay. But Packers coaches and players werer not optimistic about Walker's return to the Packers.
"I just talked to him," said wide receiver Donald Driver, "he said he feels fine. It's going to be a long road for him, but he feels good."
Walker led the Packers in receiving last season with 89 catches for 1,382 yards and 12 touchdowns.
Walker injured his knee with 7 minutes, 14 seconds left in the third quarter after catching a 55-yard pass from quarterback Brett Favre. Walker was tackled at the 3 yard line by safety Terrence Holt when he injured his knee.
"He certainly wasn't able to come back into the ball game and I doubt (he'll be back) anytime in the near future," said Packers coach Mike Sherman.
To add insult to the injury, Walker was penalized for offensive pass interference and the Packers were forced to punt one play later.
Without Walker, the Packers will be forced to insert second-round draft pick Terrence Murphy quickly into the mix. Murphy, however, did not play in any preseason games and missed a number of training camp practices with knee and hamstring injuries.
Driver and Robert Ferguson will serve as Green Bay's top two receivers, if Walker is sidelined for the rest of the season.
Three lousy points
The last time the Packers were held to three or fewer points was Sept. 13, 1992 during a 31-3 loss at Tampa Bay. The starting quarterback for the Packers in that game was Don Majkowski. The Packers had never scored three or fewer points in any game, regular and postseason, during the time that Brett Favre has been the starter, a stretch of 206 straight games.
The Lions held the Packers without a touchdown for the first time in the Packers' last 77 games. Also, the three points given up by the Lions were the lowest against Green Bay since Detroit's 24-3 win on Dec. 21, 1980 at the Pontiac Silverdome.
Starters Grady Jackson and Cullen Jenkins rotated with Colin Cole and Corey Williams at defensive tackle, beginning with the second defensive series of the game. Kabeer Gbaja-Biamila rotated with rookie Mike Montgomery, and Aaron Kampman rotated with Kenny Peterson at defensive end.
The Lions finished with 102 yards rushing, but the Packers did a good job of keeping running back Kevin Jones in check. Jones, who rambled for 156 yards against the Packers last December in Green Bay, finished with a game-high 87 yards on 25 attempts and no touchdowns.
Fourth-year pro Paris Lenon started at strong-side linebacker for the injured Na'il Diggs (knee). It marked Lenon's fifth career start. He started four games for the Packers last season.
Did not suit up
The following Packers did not suit up for Sunday's game at Ford Field: CB Mike Hawkins, LB Na'il Diggs, G Junius Coston, C Chris White, WR Terrence Murphy, TE Donald Lee and DT Donnell Washington.
QB Craig Nall was the designated third QB.
Ahman Green was limited to 58 yards on 12 carries. Green Bay averaged just 2.7 yards per rush against the Lions.
Brett Favre finished with a passer rating of 53.3. Favre completed 27 of 44 passes for 201 yards and was sacked four times.