Players who display messages on T-shirts worn underneath their strips could face punishment under new proposals.
The International Football Association Board (IFAB), the body which oversees the rules of the game, meets this weekend in Zurich, when the new regulation will be voted upon.
The new law has been proposed by the Football Association.
It raises the prospect of incidents such as Mario Balotelli's infamous "Why Always Me?" message, which he revealed after scoring against Manchester United in 2011, being banned and subject to a sanction.
The proposed text seeks to amend Law 4 of the game, which relates to political equipment:
It states: "Players must not reveal undergarments that show political, religious, personal slogans, statements or images, or advertising other than the manufacturer logo.
"A player/team of a player that reveals an undergarment that shows political, religious, personal slogans, statements or images, or advertising other than the manufacturers' logo will be sanctioned by the competition organiser or by Fifa."
The IFAB will also discuss a proposal to allow "rolling substitutions" in amateur football.
The idea behind the proposal, according to the IFAB agenda, "is to encourage people to take up the sport or to continue their participation in recreational football without affecting the professional game in any way".
The rule would not apply to competitions in which amateur teams could feasibly face professional sides, such as the FA Cup.
Other matters up for discussion, but not voting upon, include amending so-called "triple punishment" which occurs when a penalty kick is given within a game, warranting a player being sent-off and a possible goal being scored.