Liverpool manager Jurgen Klopp was upbeat despite his side's 1-0 defeat at Villarreal on Thursday night.
Adrian Lopez's injury time goal means the Reds will have to come from behind if they are to reach their first European final in almost a decade.
But the German is convinced his players are capable of a comeback as he urged the Anfield fans to play a part when the two teams meet again next week.
"Of course, I am pleased with the performance," Klopp said.
"In a lot of parts of the performance we did really well. Everybody who knew nothing about Villarreal knows more now. They are a good side, but Liverpool are a good side too and in an away game, playing football like this, controlling a game like this in most parts of the game, I think is not too usual.
"Then, the 92nd minute, a counter-attack – it sounds like it is, not too good and everybody knows it and it should not happen. We had this great moment with Alberto [Moreno], we had the header with Christian [Benteke], and so maybe a little bit the youth came into their minds.
"Until then, it was a professional performance and that was OK. It is the first leg and my first thinking when everybody was celebrating around me was 'sorry, but it's not over – you have to come to Anfield too'. We will be ready.
"I am no more or less confident then I was before the game [for the tie].
"I have more information now – and I know about this tournament and if you win today 1-0 what would have happened? It's not that we'd say it was a holiday time at home [for the second leg].
"Now we have to rule a few things, we have to find solutions for a few things, but I saw we are in a good way. I know and saw a lot of things that showed we can [win the second leg]. It doesn't mean that we will, but with the help of Anfield we can do a lot.
"Please don't compare everything with Dortmund, but things are possible and 1-0 is not the biggest result in the world. I think now Villarreal know more about us and now we have more respect. We were an English team, a big name, but no quality. Now we are an English team, big name, better quality and we will try everything."
