Manchester City suffered a shock League Cup defeat at the hands of Newcastle United, who reached the quarter-finals with a superb 2-0 away win on Wednesday that left the holders nursing the wounds of a bruising past eight days.

Newcastle’s 18-year-old winger Rolando Aarons struck in the sixth minute to hand the visitors an unlikely lead before Moussa Sissoko ended any hopes of a City fightback with a brilliant goal to gift underfire manager Alan Pardew a third win in 11 days. “We are buzzing in the dressing room. It has given the club a massive lift. It’s been a great week,” Aarons told Sky Sports.

The result completed a miserable week for City, who are now without a win in three games, after they lost to West Ham United on Saturday and threw away a two-goal lead to draw with CSKA Moscow in the Champions League last Tuesday.

Elsewhere, Graziano Pelle scored twice as in-form Southampton let slip a 2-0 lead before advancing to the last eight with a thrilling 3-2 victory against Stoke City. Tottenham Hotspur eased through to the quarter-finals with a 2-0 win against Championship (second tier) Brighton & Hove Albion.

Newcastle started with plenty of intent and their harassing and tenacity in midfield gifted them an early goal. City’s Fernandinho was caught in possession and the ball was seized upon by Aarons who surged into the box and finished superbly through the legs of goalkeeper Willy Caballero. That set-back sparked the hosts into life, but the closest they came in the opening period was when Newcastle’s Fabricio Coloccini miscued a relatively routine cross onto his own post.

City continued to press after the break but could have conceded a penalty when Aleksandar Kolarov felled Gabriel Obertan, who earlier had a goal ruled out for offside, as the Frenchman burst into the box. In the 75th minute Sissoko powered his way through City’s static defence and clipped a brilliant finish past Caballero with the outside of his right foot to give the visitors an unassailable lead. City had late chances, but the visitors remained resolute.