Dale Earnhardt Jr. uses social media to call out counterfeit memorabilia

(FOX SPORTS) -- Counterfeit memorabilia is a common problem in the sports world, but Dale Earnhardt Jr. has seen enough of it.

Earnhardt has taken to social media to shed light on illegally-produced merchandise, which includes the use of his likeness, along with his father, Dale Earnhardt.

The two-time Daytona 500 champion even came across an illegal shirt featuring UFC lightweight champion Conor McGregor, giving those responsible a funny but fair warning.