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Barcelona midfielder Arturo Vidal says his former side Bayern Munich are facing "the best team in the world" in Friday's quarter-final and not "any old team in the Bundesliga".
Bayern are fancied to beat Barca when the only two previous winners left in the Champions League meet in Lisbon.
"I understand the pessimism but we are the best team in the world," Vidal said.
"The problem is that we don't always show it."
Both Bayern and Barca are five-time winners of the European Cup, and this week 48% of BBC Sport readers picked Bayern to win the tournament for the first time since 2013.
Barca have failed to inspire this season, losing La Liga to Real Madrid and leaving manager Quique Setien - appointed in January - already under pressure,
Meanwhile, Bayern were superb after lockdown to sweep to a eighth-straight championship in Germany.
"Bayern will be confident but they must know that tomorrow they're not playing any old team in the Bundesliga, they're playing against Barca," Vidal said.
"We have Leo [Messi], we have the best players and we want to prove ourselves."
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