Running back Marcus Lattimore on Friday went through his final 49ers practice of his rookie season. After three weeks of practices, Lattimore said his confidence received a major boost from how he felt on the field and what he saw of himself on film. Lattimore, who remains on the non-football injury list, will be ineligible to practice for the remainder of the season. “If I had to play, I would play,” Lattimore told on Friday. “Without question, if they needed me, I could play. But they don’t need me right now.” Lattimore is returning after a grisly right knee injury cut short his college career at South Carolina. At the time, Lattimore was considered a potential first-round draft pick. The 49ers selected him in the fourth round with the plan of spending a year concentrating on his physical rehabilitation. On Friday, Lattimore said he fully endorses the organization’s decision. “This extra time is just going to give me enough time to get comfortable without the brace I was wearing and go out there and play like nothing ever happened,” Lattimore said.