Manchester United have quite a track record of producing ex players who could not manage that well, Giggs, Scholes, Nevilles, Charlton, Solskjaer, Bruce , Fegruson Jnr, Keane, Hughes, Robson, Ince, Webb, Phelan, Forlan, Rooney
Carrick is doing a decent job though as is Robins, Strachan did ok