Darren McFadden
Darren McFadden was forced to leave the Raiders' loss to the Chiefs on Sunday with a sprained right foot injury. Reuters

Darren McFadden suffered an injury to his right foot and was forced to leave the Oakland Raiders' 28-0 loss to the Kansas City Chiefs on Sunday.

McFadden sprained his right foot, according to multiple reports. The Raiders running back had carried the ball twice for four yards and had also caught a pass before he had to leave the game early in the first half. He did not get a touch after an early point in the first quarter.

McFadden's injury compounded the Raiders' woes on the injury front Sunday - linebacker Rolando McClain and safety Matt Giordano both left the game with injuries. McFadden returned to the sideline in the third quarter, but his right foot was heavily taped.

McFadden still leads the NFL in rushing as of Sunday night with 610 yards on 111 attempts. There's no word on how long he could be out, but the Raiders will hope their bye week has come at precisely the right time.

The loss of McFadden would present a serious obstacle to a potential Raiders playoff appearance for the first time since 2002. Michael Bush held his own at the starting spot with 99 yards on 17 carries, but McFadden's importance cannot be understated.

To add insult to injury, the Raiders couldn't muster much of anything against the hapless Chiefs, who cruised to a four-touchdown victory in the AFC West showdown.

This week, the Raiders traded a first-round 2012 NFL Draft pick and another conditional first-rounder the next year to acquire quarterback Carson Palmer. But he showed typical signs of rust in his first game this season, completing only eight of his 21 pass attempts and throwing three interceptions.

Palmer will need plenty of help from his running game as he gets comfortable with playing and with the Raiders' offensive system.