Alisson believes Liverpool must accept nothing less than victory against Manchester United to keep their Premier League title tilt on track.
The Reds are the only team still unbeaten in the top-flight and take a five-match winning streak into Sunday's crunch Anfield encounter.
Star goalkeeper Alisson, 26, has been essential to the excellent run of results, living up to his hefty price tag with a succession of clean sheets in his first season since arriving from Roma.
The Brazil international made a vital late save in the crucial Champions League victory over Napoli in midweek and is determined to secure three points in his first taste of one of English football's most feted fixtures.