ELEVATION TO FIRST TEAM
Hrustic, 20, has been training permanently with Ernest Faber's first-team squad since January after a strong first half of the campaign with Groningen's second team in the Dutch fourth tier.
The Melbourne-born attacker made his senior debut when he came off the bench against AZ on April 1 and has appeared in four of Groningen's following six games, scoring his maiden goal in a 5-1 thumping of PEC Zwolle last month.
Speaking to Goal in the lead-up to Groningen's final match of the regular season on Sunday - a 5-3 win over Twente - Hrustic appeared still to be coming to grips with his elevation to top-tier European football.
"To be honest, I don't want to stop," he said.
"I would like to keep going but my body also needs rest. I've played quite a lot of games for the second team… a little break is also good.
"It seems so long but it's only like a month since I made my debut and I even managed to get myself a goal, and it's obviously great that the coach has got so much trust in me.
"So I'm just quite flattered to be honest."
Luckily for Hrustic, Groningen have at least two games left this term, as Faber's side have qualified for the Eredivisie's Europa League play-offs.
Groningen face AZ in a two-legged tie starting on Wednesday, with the winner to play either Heerenveen or Utrecht for a spot in next season's second qualifying round of the Europa League.
FROM AUSTRALIA TO HOLLAND...AND BACK?
Hrustic was raised in Dandenong and started playing football locally before eventually joining South Melbourne's youth set-up.
He signed with Schalke in 2012 but after a tough time with injuries at the Bundesliga club, he moved across the Dutch-German border to Groningen.
And the versatile attacking midfielder's Eredivisie breakthrough has not gone unnoticed.
Hrustic was involved with an Australian development squad in March - the first time he has been selected by the country of his birth.
Asked about the possibility of a shock call-up for next month's World Cup qualifier against Saudi Arabia, the Socceroos' friendly versus Brazil and the 2017 Confederations Cup, Hrustic said: "I haven't even thought about it, if I'm honest.
"I'm never surprised but it would be an honour to represent your country.
"It was a great experience [with the development squad].
"We had a great connection from the first minute and I enjoyed my time there."
The Caltex Socceroos tackle Saudi Arabia in a crucial World Cup Qualifer in Adelaide on June 8. Click Here for Tickets