ok , thakns for all for you help
Playing as Juventus I played Attacking with high pressing in 4-2-2-1, so quite similar to Dortmund and Barca I think. It worked quite well, but
I lost 0-3 at home despite having 51% ball ownership, more clear cut chances and 5x woodwork
Messi had two incredible goals, I didn't took him into man marking
Now I think Barca is a very very good team PLUS a godlike player.
So in the second tie, away from home, I changed to a not too defensive counter tactic, stood much more narrow, and played quite faster. It almost worked, Hazard scores 0-1 in 60min.
In the 93rd minute Messi gets the ball, sprints past both my DC (which are manmarking him this game the whole time) and scores a cold goal against buffon who still was Man Of Match. Dammit! But still i'm satisfied, next game they're down!
So you need a World-Class Goalie anyways, but with Real Madrid no problem, Iker is as goog as Gigi for sure.
And really, don't give Messi any space behind your defenders, he's so lethal in using big chances - it's cruel!