Before joining the Eagles, Powell spent two seasons with the Buffalo Bills. He had 17 tackles (six assists) and a sack in 19 games. He missed the entire 2015 season with a torn anterior cruciate ligament.
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The New England Patriots released Michael Williams, two days after the tight end suffered a torn ACL in minicamp practice.
Williams was slated to be the team's third tight end behind Rob Gronkowski and offseason acquisition Martellus Bennett.
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Hall of Fame quarterback and Buffalo Bills great Jim Kelly added some pressure on Rex Ryan, predicting the team must make the playoffs this season or the second-year head coach could be out of a job.