The Chiefs elevated Thompson to their active roster Saturday, Field Yates of ESPN reports.
Thompson joined Kansas City's practice squad Friday after spending the regular season on the Buccaneers' practice squad. He'll now join the Chiefs' active roster ahead of Sunday's wild-card matchup against Pittsburgh. The 24-year-old will provide additional depth in the backfield because Clyde Edwards-Helaire (shoulder) has been ruled out and Darrel Williams (toe) is questionable.