Argentina, who topped Group C ahead of Poland, Mexico and Saudi Arabia, made it through the Round of 16 courtesy of Alvarez’s second half goal and Lionel Messi’s fine finish before the break in his 1,000th career game.
Ake awaits Alvarez after the Netherlands defeated USA 3-1 in the earlier Saturday game.
That last eight clash will take place at 19:00 next Friday in Lusail Stadium.
Messi scored the opening goal – his 789th - in the 35th minute and it was his first ever strike in a World Cup knockout game.
He fired home after being teed up by former City centre-half Nicolas Otamendi.
City forward Alvarez came off the bench in the first two games – a 2-1 loss to Saudi Arabia and a 2-0 win over Mexico – before making it into the starting line-up for the 2-0 victory over Poland in the final group match.
