Barca will aim to add to its Spanish league title on Saturday, but the Champions League was its main goal this season.
Barca coach Valverde reacted to the two-goal deficit by conducting a double substitution just before the second half, bringing on Malcom for Nelson Semedo and Arturo Vidal for Arthur. "We are all disappointed and very much, but it's not my turn to say [whether or not there will be changes].
Regrettably, that game has tainted the season", said Messi, in a rare appearance at a press conference.
Valencia will be without winger Denis Cheryshev, who also has a knee injury, although he has travelled with the team to Seville's Benito Villamarin Stadium.
"It was a very tough blow to take and it was tough to lift ourselves up, you could see that in the next few games".
"I still want to be here, beyond the disappointment".
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"I would like [Valverde] to continue", Messi said. "That's why I think we were all in our heads in the Champions League and that's why the disappointment was so great, repeating what happened in Rome".
Messi insisted: "I sincerely believe that he has done an impressive job during his time here so far and he was not responsible for the elimination in Liverpool".
Messi's first act was to tell supporters of his determination to win the Champions League for the first time since 2015, saying he would "do everything to bring that lovely and desired trophy back here to the Nou Camp".
The Argentina forward compared the loss to the 0-1 loss his national team suffered against Germany in the final match of the 2014 FIFA World Cup in Brazil. "We're going to feel weird because of what happened the other time".
"Then they scored two more goals in quick succession and it starts to look too similar to what happened a year ago. A World Cup final is the biggest thing there is and it's a huge disappointment but to have a 3-0 lead and then lose the [Liverpool] tie. they are both huge disappointments." he said. We left a very sad impression and we played so badly.
Two goals each from Divock Origi and Georginio Wijnaldum were all Jurgen Klopp's men needed to secure their second UCL final on a row.