Kansas City Chiefs guard Nick Allegretti played most of Super Bowl 58 injured.

Allegretti played all 79 snaps in Kansas City’s 25-22 win over the San Francisco 49ers despite sustaining a torn UCL in the second quarter, a person familiar with the situation told USA TODAY Sports. The person spoke on condition of anonymity because of the sensitivity of the matter.

Allegretti had an MRI on Tuesday and the results revealed a full tear.

"Beast man! We told him we needed him out there and he didn’t miss a snap!” Chiefs quarterback and Super Bowl 58 MVP Patrick Mahomes posted on X.

The Chiefs did desperately "need" Allegretti because they went into the game already thin at guard. Allegretti started Super Bowl 58 in place of injured All-Pro Joe Thuney, who was ruled out of the championship game due to a pectoral injury.

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Reserve guard Mike Caliendo would’ve been next in line on the team’s depth chart if Allegretti was unable go return to the game.

Allegretti allowed seven pressures, one sack and one QB hit in 79 total snaps, according to Pro Football Focus. Mahomes was sacked three times and hit seven times in the win. On the ground, the Chiefs rushed for 130 yards and averaged 4.3 yards a carry.

The Chiefs are the first NFL team to repeat as Super Bowl champions since the New England Patriots in 2003 and 2004.

The Chiefs drafted Allegretti in the seventh round of the 2019 NFL draft. He has won three Super Bowls as primarily a reserve guard for Kansas City.  

Follow USA TODAY Sports' Tyler Dragon on X @TheTylerDragon.