San Francisco 49ers running back Christian McCaffrey participated in practice on Thursday as a limited participant due to a calf/Achilles injury that kept him sidelined during training camp and the preseason. Head coach Kyle Shanahan expressed optimism about McCaffrey's availability for the upcoming season opener against the New York Jets, indicating the injury is not a major concern. McCaffrey, a three-time All-Pro, is critical to the 49ers' offensive success following a standout 2023 season where he led the league in rushing yards and touchdowns. With Elijah Mitchell out for the season, Jordan Mason is poised to step in as the primary backup running back if McCaffrey cannot fully participate. The team's overall health is improving as both McCaffrey and wide receiver Brandon Aiyuk returned to practice, although left tackle Trent Williams remains in contract negotiations. The 49ers aim to build on their recent Super Bowl appearance as they head into the new season.