Nfl

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Carolina Panthers quarterback Cam Newton (1), right, watches quarterback Matt Blanchard during NFL football practice in Charlotte, N.C., Wednesday, May 28, 2014. (AP Photo/Bob Leverone)

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Carolina Panthers' quarterback Cam Newton (1) walks beside rookie receiver Kelvin Benjamin (13), as Benjamin answers a reporters questions following an NFL football organized team activity in Charlotte, N.C., Wednesday, May 28, 2014. (AP Photo/Bob Leverone)

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Carolina Panthers' quarterback Cam Newton (1) gets a pass off under the watchful eye of backup quarterback Derek Anderson (3) during an NFL football organized team activity in Charlotte, N.C., Wednesday, May 28, 2014. (AP Photo/Bob Leverone)

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Carolina Panthers' quarterback Cam Newton stretches with teammates during an NFL football organized team activity in Charlotte, N.C., Wednesday, May 28, 2014. (AP Photo/Bob Leverone)

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Detroit Lions running back Joique Bell, top, prepares to hit fullback Chad Abram during an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)

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Detroit Lions quarterbacks Matthew Stafford (9) and Dan Orlovsky (8) run through an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)

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Detroit Lions tight end Eric Ebron runs through an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)

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Detroit Lions receiver Calvin Johnson runs through an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)

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Detroit Lions offensive coordinator Joe Lombardi talks to the quarterbacks during an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)

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Detroit Lions quarterback Matthew Stafford runs through an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)