SANTA CLARA, Calif. -- It appears Mario Manningham could miss his second straight game Sunday at Arizona.Manningham did not practice Thursday because of a lingering knee issue. He didn't play Monday. Rookie Quinton Patton, who was out since Week 4 when he broke his foot, took Manningham's place.That could be the case Sunday at Arizona. Manningham was on the field during warm-ups but went to work with a trainer when practice began. He came back at the midway point after being out since last December with a knee issue.