The pair met and were seen shaking hands at the Emirates Stadium on Sunday, as Ferguson travelled to London to scout his side's next opponents.
The Scot watched as a Cesc Fabregas double maintained Arsenal's impressive unbeaten league run, which has now stretched to 20 games since a 3-0 reversal at Manchester City in November.
And Wenger says his side have the belief that they can go to the Theatre of Dreams and record a positive first leg result ahead of the pair's rematch in North London.
“What is important against United is that we are at our best. When we are out our best we can beat everybody," he said.
“If you go to Old Trafford without belief you make it very difficult from the start for yourselves. We’ll go there with belief, with desire and with enjoyment. We will give absolutely everything to do it.
“We will be faithful to the game we play. We go, like we go everywhere in Europe, to score or win.”
NEWS: Fabregas set for advanced role
ARSENAL FANS! Check FourFourTwo.com’s ever-expanding interviews archive for more stuff to read:
Web Exclusives Patrick Vieira, Cesc Fabregas
Q&A Theo Walcott, Cesc Fabregas
One on One Arsene Wenger, Thierry Henry, Ian Wright
Boy's A Bit Special Theo Walcott, Armand Traore
Perfect XI Ian Wright
What Happened Next? Gus Caesar, Peter Marinello
And Another Thing Being a Big Four fan
Plus! Rate Arsenal players (and others) on Talentspotter
UNITED FANS! Check FourFourTwo.com’s ever-expandinginterviews archivefor more stuff to read:
Web Exclusives Wayne Rooney, Peter Schmeichel, Carlos Tevez
Q&A Wayne Rooney, Cristiano Ronaldo, Ruud Van Nistlerooy
One on One David Beckham, George Best
Ask A Silly Question Bryan Robson
Boy's A Bit Special Danny Simpson
Perfect XI Garth Crooks, Bryan Robson, Sir Bobby Charlton, Eric Cantona
What Happened Next? David May, Norman Whiteside
Sing When You’re Winning Dominic Monaghan, Ian Brown
