The centre-back headed in two fine Trent Alexander-Arnold deliveries in quick succession to put the Reds into a commanding lead midway through the first half at Anfield.
Alisson Becker's dismissal for handling outside his area, coupled with Lewis Dunk's goal from the resulting free-kick, made it a nervy final 10 minutes or so.
But Jürgen Klopp's side held on to reach 40 Premier League points after just 14 games this season.
Relive the highlights of the game below via YouTube as part of our Replayed series, which is looking back on each of Liverpool's league fixtures in the 2019-20 campaign on weekdays.