Mixon (knee) is officially out for Sunday's game against the Falcons, Geoff Hobson of the Bengals' official site reports.
As a result, Giovani Bernard will once again lead the Bengals' backfield Week 4, with Mark Walton on hand to serve in a backup capacity. Mixon has noted that his knee is feeling good these days, but it's still too early to know if a return to action Week 5 is in the cards for him.