I'll go for one established player and one exciting prospect in each position
in game:
GK Casillas/Asenjo
LB Evra/Mattock
CB Vidic/Sakho
CB Fazio/Thiago Silva
RB Srna/Santon
CM Fabregas/Hamsik
CM Kaka/Kroos
RW Messi/Witsel
LW Yuri Zhirkov/Douglas Costa
ST Cardozo/Keirrison
ST Villa/Paloschi
But thats just me lol.
In real life:
GK: Casillas/Ochoa
LB: Chivu/Fabio
CB: Vidic/Evans
CB: Puyol/Pique
RB: Lahm/Rafael
CM: Fabregas/Delph
CM: Kaka/Hernanes
RW: C Ronaldo/Ashley Young
LW: Messi/Douglas Costa
ST: Raul/Balotelli
ST: Rooney/Bojan