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The Buffalo Bills reportedly have released Kevin Kolb, the veteran quarterback with concussion issues.

ESPN analyst Adam Caplan tweeted the report as soon as the free-agency period opened at 4 p.m. (Update: Bills General Manager Doug Whaley confirmed the move about an hour later, saying Kolb failed a physical.)

Kolb's departure was expected. He was due to make $3.1 million from Bills this year: $2 million in base salary, a $1 million roster bonus and a $100,000 workout bonus.

The Bills signed Kolb last year to compete with rookie EJ Manuel for the starting job or -- at the very least -- provide experienced insurance at the most important position.

But Kolb's time with the Bills was forgettable. He injured a knee when he slipped on a rubber matt at training camp and was concussed in his second preseason game.

Kolb didn't return from the concussion. The Bills traded for backup quarterback Thad Lewis and put Kolb on injured reserve five days later.