Staley likely to replace Harris

San Francisco 49ers running back Elijah Mitchell is among several starters not suited up for tonight's preseason opener against the Green Bay Packers. While many aren't due to injuries, ESPN's Adam Schefter reports that Mitchell is still nursing a hamstring injury and will likely miss the entire three-game preseason. Schefter adds that Mitchell is expected to be ready for Week 1 of the regular season when the 49ers travel to Soldier Field to face the Chicago Bears. 49ers' RB Elijah Mitchell is nursing a hamstring injury that likely will prevent him from playing in the preseason, per league source. Mitchell is