There is no doubting that Flick's Barça side know how to complete a comeback. Ever since German coach joined the blaugranes, the ability to turn adverse scorelines around has become one of the trademarks of his side. It's pretty much par for the course that the blaugranes will end up winning a game they were losing initially. You don't even have to look that far back, as they have done it 10 times already this season, most recently in LaLiga at the Metropolitano stadium. However, they are now faced with an unfamiliar test.

A challenge and an opportunity

This is because the only comeback that Flick's Barça are yet to achieve is to come back in a knockout tie after losing the first leg. The opportunity is there on Tuesday away to Atlético Madrid. After losing 0-2 at the Spotify Camp Nou (0-2), the blaugranes may have a huge challenge ahead, but they also have the chance to show everyone their resilience in the face of adversity.

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The seventh two-legged knockout tie

Since Flick arrived at Barça, his team have played two-legged knockout ties, including this one, across the Champions League and the Copa del Rey. The only first leg they lost in all those was the match against Atlético Madrid in the Copa del Rey semifinals this season. After losing 4-0 in the first leg they were close to completing a comeback for the ages, but just lacked one goal to level the tie (3-0).

Also this season, Barça drew in Newcastle in the Champions League last 16 and got the job done in the second leg, and there is an even bigger sample size if we cast our eyes back to last season. The first leg matches in the Champions League were a 0-1 win away to Benfica in the last 16, a big win against Borussia Dortmund in the quarterfinals and the three-all draw against Inter Milan in the semifinals.

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The most difficult test to come

In the Copa del Rey last season, also against Simeone's side, the teams played out a stunning 4-4 in the first leg. A goal by Ferran at the Metropolitano stadium saw Barça go through to the final by the slightest of margins. This time an extra goal would be needed to at least force extra time.

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