Pilot Flying J CEO Jimmy Haslam speaks to the media during a news conference at the Pilot Flying J headquarters Tuesday, April 16, 2013, in Knoxville. Haslam said FBI and IRS raid Monday on the company was part of a federal criminal investigation into claims of failure to pay rebates to trucking customers.

The National Football League is "very, very concerned" about investigation into Pilot Flying J and CEO Jimmy Haslam, who also owns the Cleveland Browns, a 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.

Read more at KnoxNews.com.