Tyrann Mathieu left the Kansas City Chiefs playoff game on Sunday against the Buffalo Bills, and was ruled out midway through the second quarter, according to a report by Tracy Wolfson of CBS Sports.

Mathieu suffered a blow to the head during a tackle of Buffalo QB Josh Allen, as teammate Jarran Reed was also in on the play. Wolfson reported that Mathieu was being evaluated for a concussion.

Mathieu walked off the field and was met by Chiefs coach Andy Reid. The two of them spoke briefly before Mathieu took a knee, the Associated Press reported.

The injury forced the Chiefs to use backup Daniel Sorensen, one of the lowest-graded safeties in the league according to Pro Football Focus, alongside starter Juan Thornhill for the remainder of the game.

Reed also had to be helped off the field with an undisclosed injury for Kansas City early in the second quarter.

Mathieu, who tied for third on the Chiefs with 76 tackles during the regular season, is a two-time All-Pro and two-time Pro Bowl selection in 3 seasons with Kansas City.

Last season, Mathieu made a career-high 6 interceptions during the 2020 season, and led all safeties in the NFL.