Seattle Seahawks quarterback Russell Wilson is looking to set a new precedent by signing a contract that can rise in future years based on increases in the NFL's salary cap or new revenue streams the league may acquire, sources told NBC Sports' Peter King.

New revenue streams for the NFL could include gambling or future TV contracts.

Such a deal would be the first in history to fluctuate based on the league's unknown bottom line in future years, according to King.

Wilson, who's entering the final year of his current deal, has set an April 15 deadline for getting a new long-term contract done with the Seahawks.