There was an element of frustration in the stands on Wednesday night after the Gunners were held to a goalless draw by Manchester United at Emirates Stadium.
"I sense a huge feeling from the crowd to help the team but we have to strengthen that belief with our performance," the manager said.
"The crowd will no doubt be behind us [against Liverpool] but let's put the vibes out that we have a go and they will be behind us. They were hugely behind us on Wednesday night, [but] they were frustrated at the end of the game like we were."
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