FIFA has opened disciplinary cases against England and Scotland after their players wore armbands with poppy emblems.
Both countries chose to defy the football governing body by wearing the emblem to commemorate the end of the First World War in Friday's World Cup qualifier.
"We can confirm disciplinary proceedings have been opened on this matter," a FIFA spokesperson said in a statement.
"Please understand we cannot comment further at this stage nor speculate on any outcome or provide an estimated timeline."
FIFA rules forbid players from wearing anything that can be perceived as a political statement.
The FA and Scottish FA had questioned whether wearing a poppy to commemorate those who died in armed conflicts amounts to a political message which may cause offence.
Martin Glenn, FA chief executive, has said any fines would be challenged.
"If (FIFA) fine us, we'll contest," he said. "They have much bigger problems they should be concentrating on.
"I'm confident our legal position is right and our moral position is right. Our case is absolutely rock solid."
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