The Barclays Premier League side will play the Catalans at the Emirates Stadium on Wednesday.
Wilshere believes that a physical approach could serve the Gunners well against Barcelona, according to reports in the Guardian."I was at the Emirates Stadium for the first game against Barcelona last season and they were brilliant, especially in that first half," said the 19-year-old.
"I was in Bolton [on loan] for the second match and watched on television but I remember we basically played our game, passing it around.
"This year we have to get in their faces and show them what we're all about. When we have the ball, we've got to keep it as well as they can.
"We've got to change our game a bit to play against Barcelona - we'll learn from last year, but we need to get in their faces and, if you like, be a bit nasty, in a footballing sense, to get the ball back.
"We have to press them as a team - there's no point just one of us going after them, so we have to close them down as a team and get the ball back from them.
"But we'll go into the game on Wednesday looking for the win still. It's important we get that to take to their place for the return match."
The youngster has recently come to the forefront of attention in England after several displays for both club and country, and is touted to be Arsenal's next big star.
