England starlet Wilshere saw his Arsenal side ousted by Barca in the last 16.
And the Gunners midfielder said: "The thing with Barca is three passes - bang, bang, bang - and they're through. So you have to get in their faces.
"But if you can get in their faces they ease off in the second half and you really have to go for them."
"For most of it, though, they will be defending because that is what Barcelona make you do."