San Francisco 49ers running back Christian McCaffrey is optimistic about playing in Week 2 against the Minnesota Vikings despite his recent calf and Achilles injuries. McCaffrey, who missed the season opener against the New York Jets, has been practicing on a limited basis and maintains a determined mindset to play. Head coach Kyle Shanahan confirmed that putting McCaffrey on injured reserve was never an option, viewing his limited practice as a positive sign. If McCaffrey is unable to play, Jordan Mason, who performed impressively in the Week 1 win with 147 rushing yards and a touchdown, will likely take the lead role. Shanahan emphasized that caution is necessary due to McCaffrey's Achilles tendinitis, but the team will make a final decision closer to game day.