Multiple sources are reporting that Kansas City Chiefs kicker Harrison Butker will be out for at least the next four weeks after experiencing an injury to his left knee.

ESPN is reporting that Butker had initially suited up for practice Thursday, before learning that he’ll needing arthroscopic surgery on his left knee. As a result, Butker will go on the injured reserve list, putting him out of commission for four games. The Chiefs have signed Spencer Shrader off the New York Jets’ practice squad. Shrader made both his field goal attempts for the Jets last weekend and has also played a game for Indianapolis this season.

The Chiefs make their way to Buffalo this weekend to face the Bills, with kickoff at 3:25 p.m. Sunday. Pregame from the Chiefs Radio Network on KMMO-FM 102.9 begins at 2 p.m.