We could actually use him this year aswell, Coppa a couple of CL group games if we have qualified or leading comfortably, plus, whenever Pirlo is suspended or injured. A midfield of Asamoah,marchisio vidal might look great but lacks creativity.
Who's to say Pirlo will have an injury-free campaign again.
I'd say 10-15 games for a first season at Juve would be great for a 19-20 year old.