Later that day, the 49ers public relations department released a statement saying that Newsom suffered a concussion and that there were no cervical spine fractures.
The San Francisco 49ers released Wednesday's player participation report leading into practice at 10:15 a.m.
CB Dontae Johnson also suffered a concussion during Tuesday's practice and is in the league mandated concussion protocol this week. He, obviously, will not practice on Wednesday and is unlikely to be available for the team's preseason matchup against the Kansas City Chiefs at Arrowhead Stadium on Friday.
CB Keith Reaser replaced Johnson on the first-team defense during practice following Tuesday's injury.
S Jaquiski Tartt (ribs) will be a full participant during practice.
Out
OL Joshua Garnett (knee), CB Dontae Johnson (concussion), and LB Donavin Newsom (concussion)
Limited
LB Brock Coyle (ribs)