using sevilla, looking to beat barca

[alfariseriswanto]

hello guys, im in my first season and using sevilla
im using 4231 with maniche and mahamadou diarra as duo DM, and sime vrsaljko for RB.
other position filled with real sevilla player.

can you guys help me with tactic to beat barca?
i meet them in copa del rey semifinal, since i was out from euro cup, i want to win something in my 1st season

 

[nSickboy]

I would use a 4-5-1 and get your Anchor Man to man mark Messi and close him down during the game.
Also close down Busquets. Play on the counter because their fluidity will cause too many men joining the attack which can be exploited using a counter attack.
Good luck!