The National Football League is "very, very concerned" about investigation into Pilot Flying J and CEO Jimmy Haslam, who also owns the Cleveland Browns, an unnamed source told USA Today.

"The league is very, very concerned," a person with key business dealings with the NFL and multiple owners told USA TODAY Sports. The person spoke on condition of anonymity because of the sensitivity of the matter, USA Today reported.

"The NFL was completely blind-sided by this," the business associate told USA Today. "The NFL found out when the records were seized. That's not a good time to find out."

The NFL has said it has no plans to ask Haslam to step aside as owner of the Browns.

Parallels are drawn between Haslam and the case of San Francisco 49ers owner Eddie DeBartolo, who eventually relinquished control of the team to his sister.

The Cleveland Plain Dealer posted an in depth look at the DeBartolo case over the weekend.

The Debartolo case, which happened 14 years ago, is thought to be a precedent that will be considered by the NFL in considering what actions to take regarding Haslam and the Browns. While the cases have differences, they do have one common link. Haslam has hired Nashville attorney Aubrey Harwell, who represented DeBartolo during his trial.