CARDIFF, June 2 (Reuters) - Juventus coach Massimiliano Allegri says his team need to be "fiendish" to beat Real Madrid in Saturday's Champions League final.

Allegri, whose team are playing in their second final in three years after losing to Barcelona in 2015, said Real start as favourites but his team were capable of pulling off a surprise.

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"We have worked hard all year and the wins this season have been all about reaching this game. But on Saturday we need to win and we need to understand when will be the moments to attack and when to defend," Allegri told a news conference on Friday.

"We have to have the belief that we can bring that Cup home and we have to be fiendish to strike when Real offer us an opening," he added.

"Two finals in three years is an important step but it is not enough. We have to win and we must be tough, technically and tactically. We aren't here to visit Cardiff - we came here to win and take that trophy back home," he added.

"In 2015 we got to the final and deserved it but perhaps we didn’t feel confident enough because we had come out of a number of years of struggling in the Champions League. We didn’t expect to win but now it is different. (Editing by Ed Osmond)

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