Greg Olsen went to the locker room during the second quarter of Sunday's game between the Panthers and Cowboys, and when he returned to the sidelines, he was wearing a walking boot on his right foot.
Last season, Olsen missed nine games after suffering a Jones fracture in his right foot in Week 2. When he returned from injured reserve, he got injured again in his first game back, but was able to play again later in the year.
Before he was knocked out of the game, Olsen had two catches for 33 yards.