Mohamed Salah's penalty 12 minutes before time secured the victory for the Reds following a thrilling spectacle in the Spanish capital.
A Salah finish and Naby Keita's volley saw the visitors surge into a two-goal lead after 13 minutes before Atletico staged a fightback.
Antoine Griezmann bagged a brace to level the Group B encounter but was then sent off early in the second half, as Salah then won the tie with his spot-kick.
Having been named UEFA Man of the Match for a number of vital saves throughout, Alisson attended a press conference post-match – read on for a summary of the goalkeeper's comments.