SANTA CLARA, Calif. -- San Francisco 49ers coach Jim Harbaugh didn't offer much in the form of updates Monday on the concussions suffered by star tight end Vernon Davis and standout rookie safety Eric Reid in a 10-9 home loss to Carolina on Sunday.Harbaugh did say the thought of adding a tight end to the roster for Sunday's game at New Orleans is an "option." In addition to Davis, backup tight end Garrett Celek left the game in the first quarter with a hamstring injury.