The Chiefs are thin on the interior of the line after left guard Jeff Allen injured his groin Thursday night in Philadelphia. Allen did not practice Monday.
Johnson entered the NFL as an undrafted free agent with the Seahawks last season. He was released by Seattle in August and signed by the Chiefs earlier this month.
Martin was a surprise when he made the Chiefs as an undrafted free agent out of Columbia. He was inactive for the team's first three games.
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