Coach Lovie Smith announced the move Wednesday, saying “we don't give out lifetime jobs.”
The switch comes after Allen was picked off on Houston’s first play of the game against Cleveland last weekend, had a fumble returned for a touchdown and an interception brought back for another score as Houston (1-10-1) dropped its seventh straight game.
Mills led the NFL with 11 interceptions before he was benched after 10 games.
The Texans have the NFL’s worst passing offense, averaging 279.3 yards a game. Allen had two interceptions in his first start to give him five turnovers in the last two weeks and leave the Texans at minus-6 in turnover margin, which ranks 29th in the league.
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Kristie Rieken, The Associated Press