Striker Besart Berisha is also absent after being called up by Kosovo for the first time.
It means just one of Victory's attacking quartet from the 4-1 win over Perth Glory – Fahid Ben Khalfallah – will be available for selection.
Mitch Austin is likely to come into Kevin Muscat's starting XI for the Hyundai A-League clash with Roar, while the other two attacking positions could be filled by youth graduates George Howard and Christian Theoharous.
"It's exciting and I'm happy for them because I see the way they train, the way they play and they get their chance," Valeri told Goal.
"I know they'll take it because of how hard they've worked and everyone knows that around them.
"They come in full of confidence and it's just like playing with anyone there – everyone in the team who plays a certain position works the same.
"Whether it's Jimmy Troisi, he sometimes works with Chris Theoharous and they do the same things, the same movements.
"So they'll embrace it and it'll be a great game for them."
After a weekend off due to the Hyundai A-League's split round, Victory will look to gain a mental edge over another potential Finals Series opponent in Roar.
Muscat's men crushed Glory last time out after going behind early at AAMI Park, with Valeri calling on his team to eliminate lapses in defensive concentration.
"It's kind of been our problem, because we've got an attacking mindset and we're an aggressive team, we have that lapse and concede silly goals, and we all know it and we all try and prevent but it's just one of those things," Valeri said.
"I still think we could defend better, so we're forever looking to improve and I think that's a great thing.
"We're in second position with a good amount of points, so the fact that we're looking to get better I think is a great sign and a reason why this club is successful."
This article was originally published at: http://www.a-league.com.au/article/melbourne-victorys-future-stars-set-to-be-unleashed/14gy7vee39kdq1utmpk26paa7g.