Ravens RB Gus Edwards left practice Thursday after suffering a "potentially serious" knee injury, according to NFL Network's Ian Rapoport. ESPN's Adam Schefter reports that the team fears he tore an ACL. Baltimore actually cut the practice short after Edwards and CB Marcus Peters injured knees on consecutive plays. Both are heading in for testing, and we'll certainly keep watch for updates. If the testing confirms that fear, Edwards would be the 3rd RB the Ravens have lost for the season, following J.K. Dobbins (ACL) and Justice Hill (Achilles'). That would leave Ty'Son Williams and Le'Veon Bell to potentially lead the backfield in Week 1 and beyond. Baltimore also recently signed RB Trenton Cannon, but he's more of a special-teamer. Grabbing Bell off waivers where possible suddenly seems like a solid plan.