The Kansas City Chiefs offensive line has struggled to keep quarterback Patrick Mahomes upright this season, and the reigning Super Bowl MVP is growing fed up with his less-than-stellar protection.

After a long touchdown gave the Las Vegas Raiders the lead Friday night, Mahomes drove the Chiefs’ offense into the Raiders’ red zone.

Desperate for a touchdown, Kansas City appeared to be on the verge of taking the lead over Las Vegas, but a brutal third-down sack by Raiders edge rusher Maxx Crosby ensured the Chiefs settled for three points.

According to a tweet from veteran sports columnist Vahe Gregorian of the Kansas City Star, Mahomes was “demonstrably upset” after the game.

Check out the sack to see why Mahomes was so frustrated:

Expect the Chiefs coaching staff to take a close look at its offensive line as Kansas City heads toward the playoffs.

This article originally appeared on Chiefs Wire: Chiefs QB Patrick Mahomes was “demonstrably upset” after being sacked against the Raiders