Coach Romeo Crennel said Thursday that doctors have not cleared Cassel after he was hurt in the fourth quarter of a 9-6 loss to Baltimore last Sunday.
Quinn has been taking repetitions with the first team in practice this week. The former first-round draft pick hasn't started a game since he was with the Cleveland Browns.
Ricky Stanzi, the Chiefs' fifth-round draft pick last year, will serve as the backup.
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