SANTA CLARA -- As other rookies began the 49ers' three-day minicamp Friday, defensive tackle Tank Carradine and running back Marcus Lattimore could only watch practice, restricted by knee injuries that encouragingly are on the mend.
Carradine, a second-round pick, and Lattimore, a fourth-round selection, received positive reports after extensive medical exams at Stanford on Thursday.
"Everything looks good structurally with all the guys that we drafted," coach Jim Harbaugh said.
Carradine, who wore a brace on his right knee, is further along in his rehabilitation from a Nov. 24 torn anterior cruciate ligament.
"I'm very anxious, because I'm also coming off the injury and people want to know, 'Would he really be back?' " said Carradine, a Florida State product who's pegged as a backup to Justin Smith and Ray McDonald.
Lattimore said Harbaugh "stressed" to take time recovering from his second major knee injury in as many seasons, having torn the ACL in his left knee in 2011.
While Harbaugh called it premature to count out Lattimore this season, the coach added: "We're going to have to take a step back in terms of some of the cutting, because we want that inside of the knee to heal fully. But, we're good."
Lattimore is OK with sitting out all season if that's what doctors order. "That'll be fine. Whatever happens over the next few months will determine that," Lattimore said. "If I'm called upon, hopefully I'll be ready."
Reid, drafted 18th overall, sees similarities between himself and Goldson. "We have almost an identical body type. It's kind of weird," said the 6-foot-1, 213-pound Reid. (Goldson goes 6-2, 200.)
Reid met strong safety Donte Whitner on Friday in the weight room. Having received a playbook during his April 26 visit to the 49ers, Reid said it's put him "ahead of the curve a little."
Unlike all the 49ers' other rookies, Patton must return home to Nashville and is unable to report full time to the 49ers until Louisiana Tech finishes classes. Patton had an exceptional afternoon practice, showing off great speed and hands on pass routes and punt returns.
Just the same, Montana's father sent Nate to camp with a little bit of helpful advice: "He just said, 'Go out there, be yourself and sling it.' That's what I'm trying to do." Nate Montana went undrafted out of West Virginia Wesleyan, where he concluded his journeyman college career after attending De La Salle High-Concord.
Staff writer Steve Corkran contributed to this report.