Jim Harbaugh to “tough guy” Matthews: “Come with some knuckles”

A day after Packers linebacker Clay Matthews drilled 49ers quarterback Colin Kaepernick to set off a melee on the sideline, 49ers coach Jim Harbaugh ripped Matthews for the play. “A clothesline to the neck area when our quarterback is six, seven feet out of bounds . . . that certainly was a cheap shot,” Harbaugh…