Stanford running back Christian McCaffrey said he will not play in the Sun Bowl on Dec. 30, so he can focus on preparing for the NFL draft. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

Minnesota Vikings players bring down Washington wide receiver Art Monk during an NFL game in 1992. Monk was one of the lead plaintiffs in the $1 billion settlement with the NFL over brain injuries among former players. Doug Mills/AP hide caption

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Doug Mills/AP

An Oakland Raiders fan poses at the NFL Fan Fest inside the Chapultepec Park in Mexico City. The Oakland Raiders beat the Houston Texans, 27-20, at a sold-out Mexico City Azteca Stadium on Monday. Dario Lopez-Mills/AP hide caption

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Dario Lopez-Mills/AP

People pose for pictures during an NFL fan rally on Regent Street in London on Saturday. Tim Ireland/AP hide caption

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Tim Ireland/AP

Some Britons Are Learning To Love Football — The American Kind

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Colin Kaepernick, quarterback of the San Francisco 49ers, kneels during the national anthem before Thursday night's game in San Diego. Chris Carlson/AP hide caption

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Chris Carlson/AP

Kareem Abdul-Jabbar Calls Colin Kaepernick's Concerns 'Very Admirable'

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Quarterback Colin Kaepernick of the San Francisco 49ers throws a pass against the Green Bay Packers in the first half of their preseason football game on Friday in Santa Clara, California. Thearon W. Henderson/Getty Images hide caption

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Thearon W. Henderson/Getty Images