Yaya will probably frighten them based on reputation. They might not be fully aware of his slide/slight regression. I remember he tore through them on his own a few times when we last played there.
I think we have to have some semblance of control on the game and can't afford to be outnumbered in the middle. Madrid will press more at home, so as much as I agree Sterling, KDB and Navas are a counter attacking threat, they could be out of the game if Madrid outnumber us centrally.
The game got away from us last week when Silva came off and we went 4-4-2. We got played through and got at.
I wouldn't be against us lining up as we did away at Kiev with Dinho at right back, with Yaya, Fernando and KDB playing centrally, although KDB would have to play slightly deeper than he is maybe used to. I just think Dinho can kill Marcelo out wide and it's an area we should be looking to exploit.