Not gonna lie, this doesnt upset me. I just hate hiring former players/club legends right after they retire or before they've proven they're qualified for a job. Let him get his feet wet post-career, see what he's passionate about, see how he does, and when he's worthy of joining a top club like Juventus, bring him home.
Nothing is worse than seeing a former player you love like Pirlo join the club, struggle, and then watching him or rooting for him to get fired.