Vikings head coach Leslie Frazier said quarterback Christian Ponder hasn't passed concussion tests and Matt Cassel is expected to start on Sunday against the Baltimore Ravens. | More Info

Cassel: 'It's a one-week season'

Vikings head coach Leslie Frazier said quarterback Christian Ponder hasn't passed concussion tests and Matt Cassel is expected to start on Sunday against the Baltimore Ravens.

Cassel: 'It's a one-week season'

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