Dale Earnhardt Jr. has a concussion and will sit out the next two Sprint Cup races at Charlotte and Kansas.

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The injury ends NASCAR’s most popular driver’s championship chances this season.

Hendrick Motorsports says Earnhardt Jr. was diagnosed Wednesday afternoon. He sustained the concussion in the 25-car pileup on the last lap of Sunday’s race at Talladega.

Regan Smith will replace Earnhardt Jr. in the No. 88 Chevrolet in the next two events.

-AP