What went wrong for Barcelona in their collapse against PSG?

It seems were going just a little too well for Barcelona.

Xavi's side played out of their collective skin to earn a 3-2 win away at Paris Saint-Germain in the first leg of their Champions League quarter-final last week. When they went 1-0 up on the night of the second leg, it seemed for all the world they would cruise through.

And then the implosion began. For once, PSG were present for a Champions League meltdown and they were instead the onlookers rather than the unfortunate protagonists.

How did it go so wrong for Barca? What led to themlosing 4-1 on home soil?

Those of a Barcelona persuasion can try and convince themselves otherwise, but let's be honest with ourselves — Ronald Araujo's foul on Bradley Barcola was worthy of a red card. It was a daft challenge that didn't require him to make such a risk with the score as it was and with so much of the game left remaining. Just let Barcola through, for goodness sake!

But from there, Barcelona lost their heads. Every 50-50 decision seemed to against them, much to the ire of those draped in those famous Blaugrana colours inside their temporary Montjuic home.

In order to reach the semi-finals, all PSG had to do was remain calm. Their hosts were playing into their hands and the openings would follow.

Joao Cancelo's hideously stupid lunge on Ousmane Dembele led to Kylian Mbappe putting PSG in front in the tie from the penalty spot. PSG's clinching goal late on was a masterpiece of woeful defending on Barca's part, they at this point now frenzied and panicked to the point of no return — they were going down in flames one way or another.

The story would almost certainly have been different if Araujo had never been sent off. But he was. That's the reality Barcelona are struggling to