The Bills announced the signing Monday, a little over a week after the free agent agreed to a two-year contract potentially worth more than $12 million.
The sixth-year player spent the past two seasons in Arizona, where injuries hampered his opportunity to prove himself as a starter. He was cut by the Cardinals last month in a salary-cap saving move.
In Buffalo, he gets the opportunity to compete for the starting job with Tarvaris Jackson. The Bills are in need of a starter after Ryan Fitzpatrick was released last month.
Kolb spent his first four seasons with Philadelphia after being selected by the Eagles in second round of the 2007 draft.
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