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Head linesman Ed Walker had to be carted off the field Monday night after being injured on a punt in the first half of Chicago’s 20-10 win over the Minnesota Vikings.

According to Marc Craig of the Minneapolis Star-Tribune, Walker suffered a torn quadriceps while running down the sidelines. He was tended to be medical staff before leaving the field. Gene Steratore’s crew had to manage the rest of the game with just six total officials.

Walker is in his third season as an NFL official. The injury will necessitate a replacement for Walker on Steratore’s crew in the coming weeks.