NFL Collective Bargaining Agreement
College Draft
Section 2(c)Number of Choices and Eligibility
(c)
If a player who was not eligible for the Draft in any League Year becomes eligible after the date of the Draft, he will be eligible to be selected in a Supplemental Draft, if the League elects to conduct such a Draft, on or before the seventh calendar day prior to the opening of the first training camp that League Year. No player may elect to bypass a Draft for which he is eligible to apply for selection in a Supplemental Draft. Any Club that selects a player in a Supplemental Draft must forfeit a choice in the same round in the next succeeding principal Draft.