Nikic and Petric aren't in his class, anyone who even remotely follows volleyball can see that. I know it would be a risk to guarantee him a starting place, but a worthy risk, even then.
Clubs like Modena can't guarantee starting place to anyone. I'm big fan of Uroš, even know him personally but he asked too much. Giani promised him starting place to attract him in Verona but can't compare those teams.