Ivan Kostic. I can't say I'm impressed with him, I don't know what Grbic liked about him. If I am not mistaken, he plays in the Serbian league for Partizan, but his sets in the NT are often inaccurate which doesn't make him a trustworthy substitute of Jovovic. We'll see, maybe he needs time.
Jovovic himself is bad enough, so it's not hard to understand that Grbic couldn't find a substitute for him of reasonable quality.