SANTA CLARA, Calif. -- At this point, it appears unlikely rookie 49ers defensive lineman Cornellius "Tank" Carradine will make his NFL debut Sunday.Asked Thursday if he expects to play against visiting Carolina, Carradine said "probably not, with it being my first week back."The likely delay is not considered to be a setback. Carradine was activated to the 53-man roster during the bye week. He suffered a torn ACL last season while at Florida State.