Glenn Dorsey won’t label himself as such, but it appears he became the 49ers‘ new man in the middle Wednesday. San Francisco signed the former Chiefs defensive lineman to a two-year contract with undisclosed financial terms a day after its starting nose tackle, Isaac Sopoaga, signed with the Eagles. Ricky Jean Francois, Sopoaga’s backup, visited Philadelphia on Wednesday on his free-agent tour. Dorsey, the No. 5 overall pick in the 2008 draft, has been viewed as a disappointment after he won the Outland, Lombardi, Nagurski and Lott awards as a consensus first-team All-American at LSU. In five seasons as a starter with the Chiefs, he collected four sacks, one forced fumble and averaged 31.8 tackles a season. Last year, he missed 12 games with two separate calf injuries. Dorsey, 27, could benefit from a change of scenery. He was primarily a defensive end with the Chiefs, but figures to log the majority of his snaps at nose guard in San Francisco’s 3-4 defense. In college, Dorsey, who acknowledged he’s heavier than his listed weight of 297 pounds, played inside in LSU’s 4-3 scheme. In the NFL, he’s been known for his run-stuffing ability. On Wednesday, he was vague about his future role. He said defensive line coach Jim Tomsula, who picked him up at San Jose Airport on Tuesday night, only said he’d have a chance to compete and play. “I’m OK with everything,” Dorsey said. “I can play anywhere. Wherever they see fit, I’ll try my best at that position.”