Trial protocols on sin-bins, plus other measures to combat poor player behaviour, were expected to be published on Friday, but it is understood they will now be the subject of further discussion at the International Football Association Board's annual general meeting at Loch Lomond on March 2.
The introduction of a blue card, if it passed into the laws of the game, would mark the biggest single change in managing player discipline since red and yellow cards came into force at the 1970 World Cup.
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