Washington Redskins starting strong safety Su'a Cravens will undergo surgery on his knee but will return by the season opener, sources told ESPN's Adam Schefter.
Cravens injured his knee in the preseason opener Thursday against Baltimore. A day after the game, and following an MRI, a source told ESPN that Cravens had tweaked an injury first suffered at USC and would miss two-to-three weeks. That timetable remains, despite the surgery.
Coach Jay Gruden said Saturday tests had revealed no structural damage before adding they would wait until the swelling went down to see if more tests were needed.