Barbosa price 1 m pound (10 mio dkk) - 2015 From Fc Porto
Outtara prixe 2,3 m pound (22 m dkk) - 2015 from Auxerre (Transfer happening as he turned 16)
How about these two as my main defense pairing along with Bernat, Chambers and Vallejo. Outtara who initially was signed as from Auxerre at 14 years of age became the youngest arsenal player (16y36d) and the youngest French national.