Detroit Lions safety Brian Branch and Minnesota Vikings linebacker DJ Wonnum both sustained concussions during a heated showdown between the two NFC North rivals on Sunday.
The injuries occurred in a physical contest that saw both players exit the game and enter the NFL's concussion protocol. Branch, a second-year defensive back, and Wonnum, a veteran pass rusher, were evaluated on the sideline before being ruled out for the remainder of the game.
The Lions and Vikings have not yet provided timetables for their return, as both players will need to clear the league's return-to-play procedures before resuming football activities.
