I think Velizar needs to go.
Anyone from Zaytsev,Atanasijevic,Russell and even recently, Berger can play opposite. Perugia can have an italian OH/Opp next with Della Lunga instead.
Velizar is too young, inexperienced and slow in offense and defense for this level.
Ok, this is wrong on so many levels and it is becoming a tendency for the user to keep on repeating the same thing over and over that I have to deal with it one more time, I hope for the last, though. The only correct thing he/she mentioned is that Velizar is inexperienced. We can live with that. The slow defence will be dealt with later in my post.
Now, let me start. First, your statement that he should go. Why? How does a guy, albeit a foreigner, who doesn't play at all disturbs a team that rarely makes subs? It was his first match this season last night, from September till February all he ever did was train with the rest, warm up with them and stay aside when the team plays. Even if Perugia signs with Vettori, Sabbi, or whoever they might choose, if we believe your words, Perugia's opposites are Atanasijevic and Zaytsev and it will not change this season. Period.
Now, imagine you are a Perugia fan and you are probably looking for a scapegoat in case you are unhappy with the team's performances lately. Then, logically, you should blame the regular starters, the coach, or overall those with bigger salaries who don't come up to expectations. Chernokozhev doesn't get big money for sure because his status is such of a learning kid who doesn't play. Besides, he is young indeed but not that young. I have talked many times whether he should have chosen Perugia, you know my opinion, but facts are facts. Perugia seems like a decently rich club, they will organize the CL Final Four, so money doesn't look like an issue to make it a problem for Podrascanin, Zaystev, Atanasijevic, De Cecco, and Rusell altogether, let alone for the kid on the bench.
However, you may be happy with Perugia's season so far but you are angry because they lost in Roeselare. Well, Chernokozhev isn't the one to blame either. Perugia started in a disastrous way, Mitic's setting was bad almost the entire evening, the reception and overall defence often weren't quite what you would expect from a team like Perugia. Let's ignore the fact they decided to rest players. Bernardi entered a line-up that had never played together. You may also want to criticize him because Perugia missed a 9-6 lead in the tie-break (the Bulgarian wasn't even on the court at the time). Plus, the fact that they didn't just lose to any team, e.g. Dukla Liberec (no offence), but to a very motivated, fast-playing, and overall tough-to-face side of Roeselare.
Let's get even deeper if you are still uncertain. To say that Chernokozhev is slow in attack is 1) wrong, and 2) irrelevant had it been true, because we are dealing with styles here and results are what makes an opposite efficient, not technique. Velizar enjoyed a great serve evening (21 serves, 2 errors, 4 aces), scored two blocks and helped the block line with his 212 cm (or 210 cm if you wish, data vary) a lot. Well, I wouldn't expect from my 212cm-tall opposite to cover super much in defence. True, he can improve and it is a weak spot but positioning in defence is something he can work on in the years to come. It created a few problems only in the opening moments of the match last night when the whole Perugia side was messy. It surely didn't cause big issues. An element he can work on is also attack efficiency throughout the entire match, for sometimes he tends to lower his efficiency (officially he finished with 36% in attack). But he made very few mistakes, didn't take too many risks in tougher situations which helped Perugia in the rallies (let's hope with time he will get confidence to finish more rallies the way he knows), and had to deal on a few occasions with Mitic's bad sets and/or Roeselare's well-organized block. Yet, as I said, he got blocked twice and made 2 mistakes out of 36 sets he got. Even Russell who was rotated as an opposite in the tie-break made 2-3 mistakes from zone 1, almost the same number Chernokozhev acquired for 4 sets. So no, Velizar was no liability for his team in his only game so far this campaign and did actually a very decent job.
This post comes from someone who has criticized him when necessary but also from someone who knows his game well.