Barcelona midfielder Frenkie de Jong says they face four finals if they're to win the Champions League.
Barca host Napoli for the second-leg of their round 16 tie with the scores locked at 1-1.
"[Playing without fans] is a bit of an odd situation, even more so in the Champions League, where you really feel the presence of the fans," De Jong told Barca TV.
"But there are four games left to win the trophy.
"Every game is decisive, and that makes it harder."
Barcelona haven't managed to win a single trophy this year but De Jong is adamant that he doesn't feel any pressure to lift the Champions League.
"I'm always motivated, but the Champions League is clearly very special," De Jong added.
"I don't feel under more pressure now that I'm at Barcelona, it's the same in every game.
"In a single legged game the smaller teams have a bigger chance of springing a surprise.
"Of course we need to win at all costs, but playing games over one leg is harder because anyone can shock you.
"But it's a new thing for everyone, nobody has played with this format before, and all the teams that are going will be going because they deserve to be there."