Herring (undisclosed) reverted to the Browns' injured reserve list Friday, Daniel Oyefusi of ESPN.com reports.
Robinson logged two solo tackles in Thursday night's preseason opener against the Titans.
Bethune logged six tackles (two solo), including 1.0 sacks, during Thursday night's preseason opener against the Titans.
Hobbs (groin) is projected to miss a few weeks due to injury, Matt Maiocco of NBC Sports Bay Area reports.
Rourke (ribs) was discharged from the hospital Thursday night, Jennifer Lee Chan of NBC Sports Bay Area reports.
Samuel did not play in Thursday night's preseason opener against the Titans.
Stribling brought in seven of eight targets for 63 yards in the 49ers' 19-13 preseason loss to the Titans on Thursday.
Stribling brought in seven of eight targets for 63 yards in the 49ers' 19-13 preseason loss to the Titans on Thursday.
Rourke (ribs) will not return to Thursday night's preseason opener against the Titans, Matt Maiocco of NBC Sports Bay Area reports.
Rourke (ribs) is questionable to return to Thursday night's contest against the Titans, Nick Wagoner of ESPN.com reports.
