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.