Doesn't Pepe play on Neymar's side? Or is that not static? Or are you guys planning on leaving Carvajal to get nutmegged by Neymar the entire game? (If he's playing well).
I think you are either overestimating Neymar, considering his poor form, or underrating Carvajal. Could Neymar give Carvajal a hard time? Sure, but its not a given he will do whatever he wants on Sunday, like you seem to believe.