The 39-year-old won two European finals against the Red Devils in his distinguished career at Camp Nou
Xavi believes Manchester United have the strength in attack to worry a nervous Barcelona defence.
The two European giants meet in the first leg of the Champions League quarter-finals on Wednesday night at Old Trafford.
Xavi celebrates beating Manchester United in 2009
While Ole Gunnar Solskjaer has admitted stopping Lionel Messi will be of maximum importance for the Red Devils, there are a plethora of ways Barca can hurt teams.
As best exemplified against Tottenham Hotspur in the group stages at Wembley, trying to stop Messi merely creates space for the likes of Luis Suarez and Ivan Rakitic.
Former blaugrana midfielder Xavi exclusively told the Daily Mirror he feels as though his former side are not impossible to beat however.
And while the current Barca captain may well be the best in the world, Xavi feels as though the Red Devils can tear through a porous defence.
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Paul Scholes tries to get close to Xavi in 2011 at Wembley
He said: “This season Barcelona have let in more goals than is normal for them and that will give Manchester United some hope I am sure.
“In games like this you need a leader and a player like Pique need to make sure the rest of the team stay calm and composed. He has won everything and can be that leader. ”
Of course, without the firepower to trouble top European teams, progression to the later stages of this famous competition is almost nigh-on impossible.
But the World Cup winner conceded that, under Solskjaer, Manchester United are a team to be feared at this stage.
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“This is an area [up front] that Manchester United can really cause Barcelona a problem in,” he added.
“Lukaku is a big physical threat and then they have then players like Martial and Rashford who have a lot of speed, a lot of quality, and both can get goals.