The design will celebrate Andy Carroll’s stunning goal against Crystal Palace earlier this month.
In a statement on the Hammers website said: "The brand new mural will include a photo of the talismanic striker in mid-air alongside 'Carroll 9' and is being installed ahead of the Hammers’ crunch match with Manchester City on Wednesday evening."
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The new poster will replace the previous mural of Dimitri Payet, who left the club yesterday to re-join Marseille.
Earlier today, manager Slaven Bilic said the France playmaker does not owe West Ham fans an apology.
"Does he owe an apology? No. I wouldn't say that," said the West Ham boss.
Dimitri Payet joined Marseille yesterday
"Players are always moving and I'm not going that deep into what he should say or shouldn't. He is gone, he went home, that was his wish and I will not forget how good he was for us.
"He was brilliant. I was so happy and proud, with my team, my staff, to help him achieve what he did. What he achieved with us was a great story for West Ham, for the Premier League and for France.
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"I ain't going to forget it just because he moved. I really wish him well."