Former Juventus and World Cup winning Italian coach Marcello Lippi has warned that Barcelona shouldn't underestimate their opponent in next month's Champions League final and could come unstuck if they do.

"Barcelona are favourites but it won't be a walk in the park. When a team reaches the final they will not change their characteristics," Lippi is quoted as saying on Italian radio this week.

Guangzhou Evergrande v Yokohama F.Marinos - AFC Champions League

Juventus have been crowned Serie A champions in each of the last four seasons but their journey to the single biggest club game in world football was rather unexpected given the general performance of Italian clubs in recent seasons.

However, their aggregate victory over Champions League holders Real Madrid to reach this season's final was well deserved and the result of smart tactical play and disciplined hard work.

"Barcelona have never faced a side as compact and with such a defensive capability as Juventus, who also have the ability to attack when they win the ball," Lippi continued.

"Barcelona are still favourites and these extra-terrestrial players they have up front are incredibly good, although against Juventus they will not find it as easy to be as good as they are, nor against one of the strongest goalkeepers in the world."

Cordoba CF v Barcelona FC - La Liga

Chelsea manager Jose Mourinho, who has faced both teams as an opponent in recent seasons, would also seem to be siding with Lippi and putting his favour on the side of Juventus.

"I'm not saying (Barcelona will) beat Juventus. I'm not saying that because I know Italian football well and I'm not so sure they're going to beat them," he told talkSPORT this week when talking about the importance of Lionel Messi.

Juventus and Barcelona both have the rare chance to complete an historic treble this season, although Lippi believes such speculation doesn't mean anything at this stage.

"Both teams have won the league and will play in the domestic cup final and then on June 6 they will compete to see who will win the most important trophy. But it is not helpful to talk about the treble yet," he said.