Barcelona full-back Dani Alves has warned his team-mates against complacency ahead of their UEFA Champions League clash with Stuttgart.
The European champions go into Wednesday's second leg of their last-16 clash as strong favourites after scoring a crucial away goal in the 1-1 draw in Germany.
But Brazilian defender Alves believes the Spanish giants will need to be at their best in the Camp Nou to progress.
He said: "If you're not at 200 per cent, you're out.
"We have to charge our batteries and be prepared. I want to go through to the next round.
"We have a magnificent opportunity in front of our own fans and in our own stadium. We mustn't waste it.
"We know how important and difficult the competition is. The slightest slip and they can send you home.
"It's a really difficult match and we have to go flat out."
Argentina hot-shot Lionel Messi scored a hat-trick in the weekend's 3-0 defeat of Valencia to take his tally to 22 league goals for the season.
And Alves is fully aware of just how important the Fifa World Player of the Year is to the team.
"He's in excellent form. He's saving us a lot," said the defender. "We've got the best player in the world.
"He pulls the team forward, takes charge and we are the keys that help operate the command.
"I hope that the attack keeps working right to the end."
Barca goalkeeper Victor Valdes, who also shone against Valencia as he kept another clean sheet, agrees with his team-mate and believes that Messi could become even better.
"He's the best in the world," said Valdes. "What he contributes with his talent makes him stand out.
"He could become the best player in history.
"I'm happy with the way things are working out. I'm in a good moment, both individually and for the team."