The NFL issued a memo to all teams on Thursday to notify them that someone who is not certified by the NFLPA could attempt to persuade them to enter contract talks with Baltimore Ravens quarterback Lamar Jackson.

The man named in the memo, obtained by ESPN, is Ken Francis. Because Jackson does not have an agent, teams are only allowed to discuss a contract with him.

Francis contacting teams would be prohibited because he is not a certified agent.

Jackson, who was given the non-exclusive franchise tag by the Ravens prior to the deadline earlier this month, is allowed to discuss an offer sheet with another team.

"As an uncertified person, Mr. Francis is prohibited from negotiating Offer Sheets or Player Contracts, or discussing potential trades on behalf of any NFL player or prospective player or assisting in or advising with respect to such negotiations," the memo read.