Given this is Shepard’s second concussion this year, he will likely miss an extended period of time. Giants wide receiver Sterling Shepard is back in the concussion protocol, according to multiple reports, marking his second appearance in three weeks.Shepard briefly left the Giants’ loss to the Vikings on Sunday after a hard hit but returned after being evaluated. But he showed up at the team facility Monday displaying concussion-like symptoms. Giants’ Saquon Barkley on timetable for return: How can anyone tell me how long I’ll be out? The 26-year-old wide receiver already missed the Giants’ game in Week 2 while in the protocol. Related News His status at that time raised questions, as he’d suffered the concussion during the Giants’ season opener against the Cowboys but finished the game. He said he knew he had a concussion during that game, but returned to the field because “I felt like I wanted to stay in.”Shepard, who had five catches for 49 yards Sunday against the Vikings, is second on the Giants in catches (25) and yards (267) this season.