Liverpool made their return to the Champions League by coming from behind to beat AC Milan 3-1 at the San Siro.
Arne Slot's side were stunned in the opening stages with Christian Pulisic putting the home side ahead after just three minutes.
Goals from Ibrahima Konate and Virgil van Dijk saw Liverpool turn the match around, with the defenders heading in from set pieces.
Dominik Szoboszlai sealed Liverpool's victory by turning in a Cody Gakpo cross, ensuring Slot celebrated his 46th birthday in style.