The 49ers have been decimated by injuries this season — and yet, they sit at 6-4 in the thick of the NFC wild-card race.

A big reason for that is the play of one of their many replacements, quarterback Mac Jones, who has filled in well for the sidelined Brock Purdy.

That has raised speculation about whether Jones deserves the job full-time when Purdy inevitably returns from a toe injury.

San Francisco coach Kyle Shanahan isn’t buying into the idea.

“It’s not a hard decision,” Shanahan told reporters on Wednesday. “It’s just more about Brock’s health. It’s been awesome how Mac has played. He has been great. But, we’ve got a lot of confidence in Brock and we know Brock will play at a high level too as long as he’s healthy.”

Purdy, who signed a five-year, $265 million extension in the

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