Mayo's delegates will be voting against Proposal B at tomorrow's G-A-A Special Congress.
They've become the fifth county to oppose the option to turn the All-Ireland Football Championship into a league format.
Fermanagh, Derry, Armagh and Galway have also declared their intentions to vote against the proposal.
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A 60 per cent majority would be required in order for the motion to be carried.
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The G-A-A has announced the use of dressing rooms and showers are again permitted at games.
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The full use of facilities are available where all individuals are vaccinated.
Panels with mixed immunity status have been advised to use the dressing room in pods of six people.
