Bosa (knee) has been ruled out ahead of Sunday's game against the Falcons.
Coach Kyle Shanahan stated that Bosa was "a little too optimistic" with his statement that he would be back before the bye, David Lombardi of SFStandard.com reported Friday. The defensive end's chances to play were also diminished because Sunday's game in Atlanta is played on artificial turf. Bosa will continue to recover in anticipation of the 49ers' Week 9 matchup with the Raiders.