Barcelona may top their ‘Group of Death’ but they’ve been far from convincing in the Champions League this season.

They needed a Marc-Andre ter Stegen penalty save to hold Borussia Dortmund to a 0-0 draw in their opening fixture, while they barely deserved their 2-1 victory against Inter Milan in their second.

It was a similar story on Wednesday after an own goal gave them a narrow 2-1 win against Slavia Prague.

Ernesto Valverde’s side will need to improve if they’re to win their first Champions League trophy since 2015.

While their performance on the pitch in the Champions League is questionable, so too is their behaviour off it.

That’s because a video has emerged of the state that Barca left Slavia Prague’s dressing room in after the match - and it’s disgraceful.

Bottles, tape, paper and countless other items can be seen strewn across the floor.

Take a look:

Ok, we don’t expect to leave it completely spotless but have a little respect.

Maybe they should take a leaf out of the Japan national side's book.

After being knocked out by Belgium at the 2018 World Cup, they left their dressing room immaculate and wrote "спасибо" (Russian for "thank you" on a piece of paper.

Throughout the tournament, Japan’s fans had been seen clearing up the stadium after each match.

Then there’s one of the most successful sports team in the world - the New Zealand rugby side.

They have a tradition called "Sweeping the Shed" after each match.

From the very start you learn humility. There are these structures in place, like the fact that we always leave the changing room as clean as it was when we walked in,” the legendary Dan Carter once explained.

“So you’ll often see the likes of Richie McCaw and the coach Steve Hansen sweeping the shed.”

Barca could learn a thing or two.