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The Raiders already clinched their first postseason appearance since 2002, but their hopes to turn that appearance into a playoff run might've ended Saturday.

In the fourth quarter of the Raiders' game against the Colts, quarterback Derek Carr left the game with what appeared to be a painful leg injury.

After the game, Raiders coach Jack Del Rio revealed that Carr broke his fibula when he was sacked by Trent Cole and his lower body twisted awkwardly.

According to NFL.com's Dan Hanzus, Carr knew that he broke something right away.

CBS Sports NFL Insider Jason La Canfora reported that Carr was fighting back tears.

Carr was carted away from the field. He reportedly underwent X-rays immediately, which evidently revealed that broken fibula.

It was the second brutal quarterback injury of the day after Marcus Mariota suffered a fractured fibula in Tennessee's loss in Jacksonville.

Carr has pieced together an MVP-caliber season. He entered Saturday's game completing 63.5 percent of his passes for 3,705 yards, 25 touchdowns, six picks, and a 95.2 passer rating. Before leaving Saturday's game, he threw three touchdowns.

Matt McGloin filled in for Carr, helping the Raiders wrap up a 33-25 win. As it stands, the 12-3 Raiders are positioned as the second seed in the AFC. They'll face the Broncos in Denver next Sunday with a chance to earn homefield advantage through the postseason, but they'll have to do so without their starting quarterback.

According to SportsLine, Oakland's chance to win the AFC dropped from 18 percent to 3 percent after Carr's injury.