SANTA CLARA, Calif. – Wednesday, San Francisco head coach Jim Harbaugh told reporters it was possible the team may have to add a receiver to the 53-man roster if nose tackle Glenn Dorsey can't play because of a hamstring injury.Thursday, defensive coordinator Vic Fangio backed up those thoughts. He said rookie Quinton Dial could be activated in time to play at Tennessee Sunday if Dorsey, who didn't practice Wednesday, can't play.