The Brief The Atlanta Falcons opened training camp in Flowery Branch with quarterback Tua Tagovailoa sidelined by a back injury. Veteran quarterback Cooper Rush joined the roster Wednesday while Michael Penix Jr. continues recovering from knee surgery. Atlanta Falcons head coach Kevin Stefanski announced Wednesday that quarterback Tua Tagovailoa will miss the start of training camp due to a back injury. Atlanta training camp rosterWhat we don't know:Officials have not given an exact date for when Tagovailoa or Penix will receive full medical clearance for 11-on-11 contact drills. Falcons offense contract negotiationsWhat they're saying:Robinson attended practice Wednesday but stayed on the sidelines after the team exercised his fifth-year contract option.