I would honestly be prepared to overpay for Darmian if needed tbh.(something like 20m+)..This guy can cover both sides becomes such an invaluable factor for a team that has two old FB's who may or may not turn out as great next season.
We have got enough Italian talents, and especially at a time where most Italian talents are average or mediocre. We shouldn't be signing players just because they are Italian if there isn't any talent.
Ill take Pastore for 20M (hes on last year of contract) over Pererya for 15. But Id be happy with Pererya too. Rate them both a lot, just prefer El Flaco.