Campbell wrapped up nine tackles (two solo) with one pass defended in Sunday's 24-23 loss to the Cardinals.
The 49ers signed Campbell to a one-year deal Friday, Ian Rapoport of NFL Network reports.
Campbell will be released by the Packers before Wednesday, Rob Demovsky of ESPN.com reports.
Campbell made 75 tackles (46 solo), recovered a fumble and deflected a pass over 11 games in the 2023 season.
Campbell (neck) is inactive for Sunday's game against the Vikings, Mike Spofford of the Packers' official site reports.
Campbell (neck) is doubtful for Sunday's game at Minnesota, Ryan Wood of USA Today reports.
Campbell (neck) did not participate at practice Wednesday, Ryan Wood of USA Today reports.
Campbell (neck) has been ruled out ahead of Sunday's game against the Panthers.
Campbell (neck) did not participate at practice Wednesday, Matt Schneidman of The Athletic reports.
Campbell (neck) was a limited participant in Friday's practice, Ryan Wood of USA Today reports.