Dale Earnhardt Jr. backs charitable effort of NFL's Greg Olsen

Count NASCAR's most popular driver as being on board with a charitable effort being mounted by NFL tight end Greg Olsen of the Carolina Panthers.

Dale Earnhardt Jr. tweeted his support of Olsen early Tuesday morning.

Let's help out my friend @gregolsen88 raise 25k for charity and simply RT this hashtag.#OlsenWPMOYChallenge

— Dale Earnhardt Jr. (@DaleJr) December 13, 2016

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Olsen is attempting to raise $25,000 for the Receptions4Research Foundation that benefits research in congenital heart diseases and breast cancer. He certainly appreciated Earnhardt's support.

Olsen's son, T.J., was born with a serious heart defect in 2012, and has since undergone four open-heart surgeries. He certainly appreciated Earnhardt's support, which he expressed on Twitter as well.

Thanks so much @DaleJr!

— Greg Olsen (@gregolsen88) December 13, 2016

#PantherNation: help me win $25K for @R4Rfoundation by using the #OlsenWPMOYChallenge hashtag on twitter. Guy w/ the most mentions wins.

— Greg Olsen (@gregolsen88) December 12, 2016

As of 9: 26 a.m. ET Tuesday, Olsen was in the lead -- holding a narrow advantage over linebacker Arthur Moats of the Pittsburgh Steelers. Tight end Rob Gronkowski of the New England Patriots was a distant third.