The San Francisco 49ers may have the NFL's worst injury luck at the most important position.

49ers starting QB Brock Purdy hasn't played since Week 1 because of left shoulder/toe issues . And now backup Mac Jones is battling a knee injury he reaggravated in a Week 3 win over the Arizona Cardinals (2-1).

On Wednesday , 49ers head coach Kyle Shanahan said both QBs will be limited during practice. He added Purdy is healthier than he was in Week 3 but didn't commit to him playing in Sunday's home game against the Jacksonville Jaguars (2-1). Who will San Francisco (3-0) start if both signal-callers are out?

49ers' replacement for Purdy and Jones isn't ideal

The 49ers would elevate backup QB Adrian Martinez from the practice squad if Purdy or Jones can't play. The Nebraska/Kansas St

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