A bit of “good’’ news from Rams Park on Friday — not a lot of that lately — as the lower-leg fracture suffered by rookie safety T.J. McDonald will not require surgery and is not a season-ending injury. McDonald a third-round draft choice in April was placed on the injured reserve-designated to return list Friday which means he’ll miss at least eight weeks (six plus two weeks of practice) before returning to action. “It times up with the doctor’s estimation of when he’ll be back so it’s not season-ending; that was in a lot of ways good news for us’’ Rams head coach Jeff Fisher said at the start of his Friday meeting with reporters in Earth City. “There’s one move per club per season; it’s a new rule ... for two years now.’’ McDonald a 6-foot-2 217-pounder from Southern California is fifth on the team with 18 tackles. “He was playing well’’ Fisher said. “In addition to things defensively he was close to blocking punts and he was playing well for us on special teams.’’ Cody Davis a rookie free agent from Texas Tech was promoted from the practice squad to take McDonald’s spot on the roster with veterans Darian Stewart and Matt Giordano to vie for the spot opposite Rodney McLeod in the defensive backfield. “Stew’s healthy — he’ll get a chance” Fisher said. “Gio’s going to get a chance and we’ll have to make some adjustments in the secondary as we start deploying our different packages our nickel packages and things. But again we’re fortunate to have a couple of days.’’ The Rams return to action Oct. 6 against Jacksonville at the Edward Jones Dome. Fisher added that a pair of veterans cornerback Cortland Finnegan and linebacker Will Witherspoon will be slowed with hamstring injuries suffered against San Francisco.