Barcelona have exited the Champions League at the quarter-final stage for the third time in four years - what is going on?

Having lost 3-0 to Juventus in the first leg last week, Luis Enrique's men were unable to repeat their heroics against Paris Saint-Germain and turn around the tie, drawing 0-0.

Lionel Messi, Luis Suarez and Neymar all struggled at the Camp Nou, with Juve's rock-solid defence quite literally building a wall in front of Gianluigi Buffon.

Speaking after the game, Gerard Pique hailed Barcelona's fans for their unwavering support and explained how Juventus deserved to progress.

"It's a very difficult loss, but the fans singing like that deserve to be remember," he said, per AS. "It fills me with pride to see the Camp Nou like this.

"Juventus are a great team and they were better than us. I wish them the best and I think they can go on to win the title.

"We made the game very difficult. It was a result that was very complicated to recover from, however we did fight until the last whistle.

"They are Italians and they defend very well. They achieved their objective."

Barcelona's focus will now switch to the La Liga title race, where they trail to Real Madrid, but there's something concerning about the way they've performed of late.

While they tore apart PSG six weeks ago, the Catalonians have looked a shadow of their former selves in 2017 and don't seem to have a plan B.

Against Juventus, for example, when Messi and co. found themselves unable to penetrate the defence with their usual passing, they appeared out of ideas.

Put simply, there's a growing sense that Barcelona are no longer Europe's finest.

That's the opinion of Claudio Ranieri who, speaking after the game on BT Sport, summed it up by explaining how Barcelona's days of dominance are over (see below).

He said: "How long does it take Barcelona (to lose top spot), 10 years? It's the right time.

"There was Manchester [United], Ajax, Juventus, Milan, Inter, Barcelona, Real Madrid - and now it's finished. Barcelona is down now."

Brutal, but true. With Real Madrid, Atletico Madrid and Juventus all going strong in the Champions League, it's clear that Barcelona are no longer top dogs.