Neymar has said Barcelona will not give up against Paris Saint-Germain after their 4-0 demolition in the Champions League on Tuesday.
The French champions' dominant display at the Parc des Princes means Barca will have to become the first team in Champions League history to recover from a four-goal deficit if they are to remain in the competition.
"PSG deserve credit," Neymar told reporters. "They were great throughout the game, took their chances and were good at getting into our box.
"Now we need to think about the next game, see what we can do and try to turn it around. It will be really difficult, practically impossible -- but we can't give up.
"It will be tough to prepare. We're four goals behind... I don't think I've ever been in this situation. All I can to do is give my maximum and help try and turn it around.
"It was an abnormal game for us. That hardly ever happens to us."
Neymar disputed the idea that Barca had been caught cold by the calibre of Unai Emery's side.
"No, we knew that PSG had a great team," he said. "They have very good players, players with a lot of quality.
"It's not that we weren't good, just that we didn't do the right job and for that reason we were surprised by the result."
Barca midfielder Sergio Busquets said his side had been beaten by the superior team.
"The were better than us," he said. "They played better, they were better tactically and they outdid us physically.
"It's not about the attitude, it was a football thing. PSG were better tactically. It will be very difficult at Camp Nou but we will try. We always try."