The Catalans' hopes of a treble were dashed when they squandered a three-goal lead against Liverpool, who turned in a fantastic performance at Anfield to triumph 4-3 on aggregate in their semi-final.
Messi would be the man charged with hoisting the trophy aloft as he rounds off his first season as Barcelona's captain.
The result has put Valverde under pressure from fans and media, despite the coach having the potential to secure a second straight domestic double with victory in the Copa del Rey final over Valencia on Saturday.
The usually tight-lipped Messi did not hold back in his criticism of Barca's display at Anfield.
"I think the coach has done an impressive job", Messi told reporters.
"I think on a mental level some of us were affected by what had happened in Rome, it was so recent".
"We're all aware that when there's an elimination, an unexpected one like this, we're all responsible".
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"Now we have a final, a chance for a trophy, we have the chance to do a double and finish the year well, we have to win it like every final we play in". The truth is what happened can not be allowed. Messi is stil focussed on Barcelona and even if he has to wait another year to win the Champions League again, his passion for the shirt remains intact. "We tried to play Barcelona's style, sometimes it's easier, sometimes it's hard".
"I would like [Ernesto] Valverde to continue".
"If you look around the coaches in La Liga, we are part of the show".
"Apart from the Liverpool game, Barca have made a great year, winning LaLiga and trying to win the Copa del Rey". "You could see that the team just wasn't functioning, they were putting us under pressure and what had happened past year (against Roma) was very present in our minds", Pique said in an interview with Spanish newspaper El Pais published on Friday.
Messi also suspects that defeat to Valencia on Saturday could cause further turmoil.
The 31-year-old said: "I want to keep competing at Barca and I have never thought about leaving the club". "We are all disappointed and very much, but it's not my turn to say [whether or not there will be changes]". Liverpool were much, much better than us.
Asked about whether he was left to think about the disappointment over the two Champions League defeats, Messi conceded it does haunt him. "Regrettably, that game has tainted the season", said Messi, in a rare appearance at a press conference. But what motivates me most is what it would mean for everyone after such a big disappointment.