Both countries chose to defy FIFA by wearing poppies in Friday's Group F match to commemorate the armistice that ended World War One.
"We can confirm disciplinary proceedings have been opened on this matter," a spokesperson for soccer's governing body said on Thursday.
"Please understand we cannot comment further at this stage nor speculate on any outcome or provide an estimated timeline."
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FIFA rules forbid players from wearing anything that can be perceived as a political statement.
(Reporting by Toby Davis; Editing by Tony Jimenez)
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