The two superpowers will clash in a repeat of the 2009 final in Rome, which was won by the Catalan giants.
The former Portugal international, who featured regularly at Camp Nou between 1995 and 2000, is expecting the unexpected, but when pushed to pick a winner, he chose Barca.
"It's logical that I prefer Barcelona [to win] because they are a Spanish club. But, I am not under pressure to play - I hope to see a great game," he told ONA FM.
"I think anything can happen in the final. Barcelona can be deemed as favourites, but Manchester United are also there and being an important final, anything can happen."
All eyes will be on Lionel Messi who struck against United two years ago, and Figo reckons that the Argentine is otherworldly.
"Messi is incredible. His quality and passion for football, he is from another planet," concluded Figo.
Kick off is at 20:45 CET, and Barcelona beat Sampdoria 1-0 the last time they played a European Cup final at Wembley, in 1992.
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