Inter boss Luciano Spalletti still expects they will advance if they beat PSV because Barca are so formidable at home.
It would mark an impressive achievement if they were able to do it, as they looked dead and buried at the halfway stage of the group with just one point from their opening three games.
"It was a very good move", Eriksen said, "and I'm happy to finish it". "But probably it's the only mistake we made".
"When (Alli) is under pressure he is unbelievable", Pochettino said.
"But I keep on saying that we need to do what we need to do, which is to play and win against PSV".
Tottenham must still beat Barcelona on December 11 at the Camp Nou to make sure of advancing to the knockout phase.
Tottenham Hotspur defender Jan Vertonghen could make his first appearance in almost two months against Inter Milan in the Champions League at Wembley on Wednesday after recovering from a hamstring injury, manager Mauricio Pochettino said.
Spalletti hopes Barcelona doesn't give its stars a rest.
Neymar inspires PSG to leave Liverpool in danger in Champions League
Neymar's goal was not only a victor , it saw him become the all-time leading Brazilian goalscorer in Champions League history. On a tricky night for English clubs, Tottenham was heading out until Denmark playmaker Eriksen's goal earned a reprieve.
"I am convinced that if we do what we have to do, we shall go through". I don't even dare to have a shadow of a doubt.
Pochettino is also expecting a big performance from England worldwide midfielder Dele Alli, saying the 22-year-old plays his best football when the stakes are highest.
"But, of course, in the Champions League, no one is going to give a present and play and not care about the result".
But Eriksen, surprisingly dropped to the bench by Pochettino, came to Tottenham's rescue when the substitute fired home to take their Group B qualification bid down to the final game. But a campaign that was in peril is alive again for Tottenham, which has never lifted the European Cup. Then at the end of our match I will ask what the score of the other match was, but we need to win our game. "It is about what we do", he said.
A draw and victory against PSV revived Tottenham's prospects, showing the resilience that has Pochettino's side in third place in the Premier League only five points behind Manchester City.
Meanwhile, Tottenham will visit the Emirates to face Arsenal on the same day in the Premier League, in a huge north London derby.
"To arrive in that way in Barcelona we need to manage and we need to rotate the squad".