Champions League comebacks: How the quarter-final ties could be turned around

When the second-leg whistles blow across Europe this week, four clubs will defend advantages and four will chase miracles. Arsenal, Atlético Madrid, Bayern Munich and Paris Saint-Germain carry leads into Tuesday and Wednesday, yet history insists that a 90-minute evening in the Champions League can flip any narrative.

Barcelona’s task looks the most achievable on paper. A 2-0 deficit at the Metropolitano sounds daunting until the details of the first leg are re-examined. Hansi Flick’s side played 52 minutes a man down, still finished with 58 per cent possession, more shots, more big chances and a superior expected-goals tally. Bookmakers have responded by pricing Barça at 4/6 to win inside 90 minutes on Tuesday and 12/5 to qualify. Memories of the Copa del Rey semi-final—when they roared from 4-0 down to 4-3 on aggregate—feed the belief that Lamine Yamal, Pedri and Dani Olmo can unpick the low block Diego Simeone is certain to deploy. Atlético, seeking a first semi-final berth since 2016-17, will welcome a backs-to-wall evening if it delivers the final whistle.

Liverpool face a taller order. PSG’s 2-0 win at the Parc des Princes was comprehensive: 74 per cent possession, relentless midfield control and a general sense that Arne Slot’s side never landed a glove. Yet Anfield on a European night is a different proposition; Liverpool have lost only once at home in this season’s competition and have scored 10 goals across their last two Merseyside European fixtures. The odds—5/1 to overturn the deficit—reflect both the scale of the task and the club’s pedigree. Disrupting the rhythm of Vitinha, João Neves and Fabian Ruiz will be essential, while the potential inclusion of 17-year-old Rio Ngumoha, fresh from a goal against Fulham, could supply the spark a blunt attack craves.

Across London on Wednesday, Arsenal carry the healthiest buffer: a 3-0 lead over Sporting CP. The Gunners, however, arrive at the Emirates on a three-match losing streak in all competitions and bruised by Bournemouth’s shock win at the weekend. Ruben Amorim’s Portuguese champions, 10/1 to qualify, already erased a 3-0 deficit in the previous round against Bodo/Glimt, scoring five unanswered goals in the second leg. Luis Suarez, Geny Catamo, Pote and Trincao have combined for ten Champions League goals this term and will target the same transition moments that unsettled Mikel Arteta’s side on Saturday.

Bayern Munich against Real Madrid is the tie that best illustrates the competition’s refusal to do scripts. For 74 minutes at the Bernabéu the Bavarians were imperious, racing into a 2-0 lead through Luis Diaz and Harry Kane and looking every inch the tournament favourites. Kylian Mbappé’s away goal changed the temperature; the tie is 2-1 and the holders are still only 13/2 to advance. No player has scored more Champions League goals this season than Mbappé (14), and Vinicius Junior, Jude Bellingham, Arda Guler and Fede Valverde all carry match-winning pedigree. Bayern’s home record—five wins from five, the highest goals, shots and big-chances rate per game of any side—marks them out, yet Madrid have thrived for decades on evenings when the odds say they should be finished.

Comebacks are not guaranteed, but they are never impossible. Four teams will hope to prove that again before the semi-final line-up is complete.