The International Football Association Board (IFAB) has postponed the introduction of a new blue card as part of trials of sin bins in professional football, sources have told ESPN.
Football's lawmakers announced in November measures to improve player behaviour and increase respect for match officials, which included temporary dismissals for dissent and specific tactical offences.
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The IFAB was due to announce protocols for the trial on Friday, including a blue card to distinguish the offence from a yellow and red card.
However, there will now be no announcement until after the IFAB AGM on March 2, when all proposed trials and law changes are discussed before being approved for use from June 1.