Petrovic was assigned as coach of the national Serbian team, and as a measure, Poli's management as appointed a technical staff composed of Cosmin Contra, Vali Velcea, Iosif Rotariu to lead the team. The latter two were also assisting coaches in previous mandates, but Contra, who has just signed an extension to his contract as a player, has no experience coaching. Whether he will resign his career, or he will fulfill both roles for the near future, remains to be seen, but signs say he will concentrate on coaching.
It's a bit risky to appoint such a young, and inexperienced staff, and probably also a bit lazy from the management. What's done is done, and we will see how things go on.
Good luck, Cosmin!