Barcelona are officially out of the 2021/22 UEFA Europa League.

The favourites to win the competition were beaten 3-2 (4-3 on aggregate) by Eintracht Frankfurt on Thursday evening in what was an epic encounter at Camp Nou.

A brace from Filip Kostic and a stunning strike from Rafael Santos Borre secured one of the most famous victories in the German side's history.

Barcelona scored two goals in stoppage-time through Sergio Busquets and Memphis Depay, but they proved to be merely consolations.

Frankfurt will now play West Ham United in the semi-finals of the Europa League after the Premier League outfit's resounding 3-0 win away at Lyon.

It's set to be a brilliant knockout tie and you can be certain the atmosphere in both stadiums across the two legs will be enough to give those watching from the comfort of their homes goosebumps.

BARCELONA, SPAIN - APRIL 14: An Eintracht Frankfurt fan holds up a scarf to show their support during the UEFA Europa League Quarter Final Leg Two match between FC Barcelona and Eintracht Frankfurt at Camp Nou on April 14, 2022 in Barcelona, Spain. (Photo by Eric Alonso/Getty Images)

And if Thursday evening is anything to go by, West Ham should start preparing for an influx of Frankfurt fans at the London Stadium.

Why do we say that? Well, around 30,000 of the German side's supporters were in Barcelona for the game and it seems the majority of them made it into the stadium as well.

Various videos taken after the full-time whistle had been blown show the absurd number of white-shirted Frankfurt fans who were in the stands to congratulate their team on a memorable victory.

Take a look at the footage...

Video: The ridiculous number of Frankfurt fans in Camp Nou

How on earth has that been allowed to happen then? The volume of white shirts had Camp Nou looking like the Santiago Bernabeu and serious questions have to be asked as a result of that.

After the match, Xavi bemoaned the Frankfurt fan invasion, the Barcelona manager telling the media: "I was expecting 70,000 or 80,000 cules here but it wasn't like that. The club is checking what happened."

Uruguayan defender Ronald Araujo added: "I'm surprised there are so many German fans in the stadium. The club will have to look at that."

Football Terrace weekend preview show

President Joan Laporta also offered his opinion on the matter after the conclusion of the game: "What happened in the stands is a disgrace that cannot be repeated. We have to review the information we have and take measures. It's lamentable. We have to be stricter and not allow certain things. I feel ashamed as a Barcelona fan."

He's right, what happened on Thursday is simply unacceptable for a club the size of Barcelona and significant changes now need to be made in response.

Europa League quiz: Can you name these obscure Premier League players in Europe?