VIDEO: Barcelona 2-3 Frankfurt (AGG 3-4) – Barca Knock Out of the Europa League

After the first leg had finished 1-1, the German side stormed into a 3-0 lead in the second and looked in control before two late goals for Barcelona.

Filip Kostic's penalty and Rafael Borre's superb strike were followed by another for Kostic after the break.

But Sergio Busquets' effort and Memphis Depay's penalty set up a tense finish.

Frankfurt defender Evan Ndicka was also sent off for a second yellow card for what looked like a soft foul on Luuk de Jong for the spot-kick, with nine minutes added on following a VAR malfunction.

But Frankfurt, who sit ninth in the Bundesliga and won this competition in its previous guise in 1980, saw out a memorable victory to the delight of their almost 30,000 traveling fans.

After the match, Barcelona manager Xavi was critical of the fact that so many away fans were able to gain access to the stadium.

Barcelona president Joan Laporta told his club's television channel: "Frankly what happened makes me feel embarrassed and ashamed. There were many fans of the other team and not many of ours.

"I'm very sorry for what has happened.

"What we can avoid are certain situations but as of now, we will have to be much more strict. We can't allow these situations to happen."

Barcelona, on a superb run since the arrival of Xavi as manager, did not know how to cope with the Bundesliga outfit's clinical counter-attacks and Frankfurt could have had more.