As they will be in Cardiff, Juve sought a treble when they faced Barcelona in Berlin, but they were left dented by a 3-1 defeat.EXCLUSIVE: Ronaldo or Dybala goal offer
Allegri freely admits that his side then had not reached the final out of expectation, but he says - with a sixth straight Serie A title and the Coppa Italia in the bag - that this year feels much different.
He told a news conference: "In 2015 we got to the final but at the same time we were not strongly motivated, we were not confident enough because we had lots of years of struggle in the Champions League.
"We certainly didn't end up in the final by chance but we didn't expect to win.
"This year is different. Last year, we had a good season in the Champions League, lost to Bayern Munich [in the round of 16] just one minute before the end of the game and we have been growing gradually.
"Now it's completely different, Juventus has improved a lot."
Dominant domestically once again, Allegri hopes Juventus can draw strength from pummelling their league.
"All I can say is we worked for a year and all the trophies and wins we've had this year have been training for tomorrow," he said.
"Tomorrow we have to win. It's a final, it's one game.
"So like all one-game finals, you have to play in a certain way. You have to analyse when you need to attack and when you need to defend.
"If we can do that, with a bit of luck, we shall have a possibility but we need to be convinced and confident."