yeah, I saw it the other day against Villarreal
unfortunately you cannot reproduce the proper behavior from the defense.
The outside CBs do not play wide at all, and never get forward (no matter what settings you use). If you set them to sidebacks instead, it leaves you completely exposed through the middle. Best bet is to put the outside CBs as DMs and play as wide as possible.
I'd also say Alcantara should be almost like a RM instead of a CM. He was essentially Barca's Right wingback who "cut inside" and "roams" although this too is also extremely hard to implement in FM.