Nielsen anticipates the U.S. sports gambling market being worth $2.3 billion annually to the NFL.

The report, released Wednesday, was commissioned by the American Gaming Association, the trade group that represents the gambling business.

A nationwide, legal sports betting product available to all would affect annual media rights fees by nearly 18 percent, sponsorship by more than 7 percent and ticket sales by more than 6 percent.

Nielsen's report does not factor in so-called "integrity fees."