GREEN BAY, Wis. (AP) – Green Bay Packers wide receiver Jordy Nelson injured his hamstring during the second drive of Sunday’s game against the Minnesota Vikings.  Nelson limped off the field midway through the drive, and immediately headed for the Packers medical staff. He left the field after Mason Crosby kicked a 30-yard field goal to give Green Bay a 10-0 lead. It’s not clear if it’s the same hamstring that forced Nelson to miss Green Bay’s Oct. 28 game against Jacksonville.     The injury comes just as the Packers receiving corps was getting back to full strength. Greg Jennings was active Sunday for the first time since Sept. 30.