Both excellent players, but we need to play defense first. We have been exposed on numerous occasions in Serie B. When we get to Serie A it will magnify this problem ten fold. We need to secure the center of the field defensively first. Then add the skill.
I like Mavuba, but I question his maturity. He has the skill but does he have the experience at age 22 to control the center of the Juventus midfield in Serie A. We need to defend teams like Milan, Inter, Roma, Fiorentina, etc. Not Lille or Lyon. I am a fan of his, but only if he comes with a full-time solid DMF.