NFL Collective Bargaining Agreement
Anti-Collusion
Section 2(b)Other Club Conduct
No Club may have a policy not to negotiate with, or enter into a Player Contract with, any player who is free to negotiate and sign a Player Contract with any Club, on any of the following grounds, if such policy is inconsistent with Section 1 above:
(b)
that the player has refused or failed to enter into a Player Contract for a prior season containing a Right of First Refusal or an option clause (i.e., any clause that authorizes an extension or renewal by a Club of a Player Contract beyond its stated term);