NASCAR's most popular driver, Dale Earnhardt Jr. will miss one of the biggest races of the year at the Brickyard.

FOX's Marghiee Teshineh has the details: 

Dale Earnhardt Jr. after complaining of concussion like symptoms of nausea and balance issues sat out last week's race at New Hampshire, has announced he will sit out the next two races. This weekend's race at Indianapolis Motor Speedway and Pocono at the end of the month.

Replacing Earnhardt in the No. 88 car will be his former Hendrick Motor Sports teammate, Jeff Gordon, who retired last season from full time racing.

This is not the first time Earnhardt has dealt with concussion issues. In 2012, Earnhardt missed two races because of two concussions over a six-week span.

I'm Marghiee Teshineh, FOX News.

Follow Marghiee Teshineh on Twitter: @LadyTrackSide