Pittsburgh Steelers running back Jaylen Warren has suffered a hamstring injury and is expected to miss multiple weeks with the ailment. NFL Network insider Tom Pelissero reported the news on Sunday, noting Warren’s status for the season opener against the Atlanta Falcons on Sunday, Sept. 8 is now in jeopardy. Warren is coming off a second season in Pittsburgh in which he ran for 784 yards and four touchdowns, while also catching 61 passes for 370 yards. He’s a versatile threat, one the Steelers will miss while he’s out. The hope in Pittsburgh had been that Jaylen Warren could shoulder an incre…