Northern Ireland will look to make it two wins out of two when they meet Finland in the Euro 2024 qualifiers on Sunday evening.
Michael O'Neill's side kicked off the new campaign with a 2-0 win over San Marino on Thursday night.
Now they return to home soil for the visit of Finland to Windsor Park, O'Neill's first home game since returning as boss last December.
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The former Stoke City manager will be hoping for a wall of noise at Windsor, with the Green and White Army hopefully cheering his side on to another three points.
And the fans are ready to play their part, by 'bringing the colour and noise' to the international stadium.
The Amalgamation of Official Northern Ireland Supporters Club has sent out an appeal to all supporters attending the game to wear their jerseys, scarves, flags and anything else green.
The fans' group said: "Bring the colour! Bring the noise!
"Ahead of Sunday night's first home game of the qualifiers, we're encouraging everyone to play their part in creating the famous 'Sea of Green'.
"We're encouraging everyone to "bring the colour, bring the noise." Northern Ireland shirts, Northern Ireland scarves, Northern Ireland flags.
"Let's see and hear the famous 12th Man again!"
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