Shortly before the start of the San Francisco 49ers' season opener against the New York Jets on Monday Night Football, Christian McCaffrey was listed as inactive due to an ankle/Achilles injury.

McCaffrey was initially listed as questionable for Monday's tilt with the Jets after participating in practice on a limited basis during the week.

After the game, McCaffrey's backup, Jordan Mason was asked when he found out he'd be starting in place of the All-Pro running back.

Coming off a breakout performance, Mason mentioned he'd found out on Friday he would be starting. When speaking to reporters after the game, Kyle Shanahan said he'd never told Mason he would be starting on Monday against the Jets.

Before Week 2, the NFL looked into the 49ers reporting of McCaffrey's injury status. In a statement released on Friday, the 49ers didn't violate the NFL injury status rules according to the NFL.

Via @RapSheet on Twitter:

McCaffrey is now set to miss his second consecutive game on Sunday against the Minnesota Vikings. Mason is expected to step in as the starter at running back in Minnesota.

This post originally appeared on Niners Wire! Follow us on Facebook and Twitter!

More Latest 49ers news!

49ers injury update: Christian McCaffrey could go on IR

49ers injury update: Christian McCaffrey OUT vs. Vikings

Vikings young star pass catcher ruled out vs. 49ers in Week 2

This article originally appeared on Niners Wire: NFL ‘looked into’ 49ers handling of Christian McCaffrey injury status