New York Giants superstar running back Saquon Barkley exited Sunday's game in the third quarter with a shoulder injury, but returned late in the fourth quarter.By video, Barkley appeared to suffer a mild AC joint sprain on a hard tackle from Packers linebacker De'Vondre Campbell, according to the Pro Football Docs.Barkley was seen flexing his right hand on the sideline, indicating a possible stinger as well.The initial impression was that Barkley could return with an injection for pain tolerance. He returned in the fourth quarter and had a 41-yard catch a run, plus the go-ahead touchdown run.Barkley has 13 rushes for 70 yards and a touchdown, plus 3 catches for 36 yards in the game.