Arsenal manager Arsene Wenger pinpointed Ronaldinho as Barcelona's key threat after watching the Catalan side reach the Champions League final.
Wenger stayed on in Spain to watch Barcelona
"Ronaldinho, at any moment, can do something special," said Wenger after Barcelona beat AC Milan on aggregate to progress to the 17 May Paris showpiece.
Wenger added: "I think we have a chance and let's prepare well.
"If you are capable of grabbing your chance you can win the final. We want to make it our destiny, of course."
Barcelona coach Frank Rijkaard insisted he had not turned his thoughts to the final against Arsenal.
He said: "It feels good - we are very happy to be in the final. If you qualify it has gone as planned, so we are satisfied.
"We had to work really hard for it, but at the moment I am thinking nothing about the final.
"I am just thinking about the next game against Cadiz, because every game is very important for us.
"These games are more important and we will see about the final when it is our next game.
"We had self-belief - and without self-belief you can't play at this level."
Milan were furious that Andriy Shevchenko's 68th minute header was ruled out for a foul on Carles Puyol.
Coach Carlos Ancelotti said: "It was absolutely legal. He jumped and hardly touched Puyol.
"It was a goal, Puyol lost his balance. With a referee of this level you can't have mistake like that. We feel penalised.
"We gave our all, it was an excellent game against a very strong side. We were on equal terms in both games.
"As in the first leg we looked for the win, we created some things and of course gave them some opportunities as well. The team did everything that I wanted from and that they could do.
"The only regret is that we weren't able to get the goal we deserved."