Flowers (hamstring) was listed as a non-participant for Wednesday's practice.
Stribling underwent ankle surgery Wednesday and is expected to miss 10 weeks, Matt Maiocco of NBC Sports Bay Area reports.
Tonges (knee) required surgery for an MCL tear and is done for the season, Cam Inman reports.
Tonges (knee) was placed on injured reserve Wednesday.
Coach Jesse Minter said Wednesday that Flowers (hamstring) still is considered day-to-day, Jamison Hensley of ESPN.com reports.
Coach Jesse Minter said Lane underwent wrist surgery Wednesday, and the Ravens placed the rookie wide receiver on injured reserve, Brian Wacker of The Baltimore Sun reports.
The 49ers are expected to place Stribling (ankle) on injured reserve, Adam Schefter of ESPN.com reports.
Flowers (hamstring) wasn't seen during the media-access portion of Wednesday's practice, Jeff Zrebiec of The Athletic reports.
Hamilton logged five tackles (three solo) in Sunday's 41-23 win over the Colts.
The 49ers signed Willis from the practice squad to the active roster Tuesday, Nick Wagoner of ESPN.com reports.
