Sydney FC's Fabio is set to escape A-League sanction for a crude tackle which will sideline Melbourne Heart youngster Ben Garuccio for a month.
Scans on Monday showed the incident caused Garuccio to strain one ligament in his right ankle and partially tear another.
The 17-year-old was felled from behind by a lunging tackle from the Brazilian defender in the second half of Sunday's scoreless draw at Allianz Stadium.
"It's difficult to gauge a specific timeframe, but you'd say it would rule him out for at least a month," Heart football manager John Didulica told AAP.
The incident did not attract a card of any colour, infuriating Heart coach John Aloisi, whose club sits above only Sydney on the A-League table and are missing three players on Socceroos duty.
"I'm struggling to have players and then that tackle happens and there's nothing, not even a yellow card," Aloisi said post-match.
"I saw the replay and it's probably a red card and I have to go one less player again.
"I keep my mouth shut every week about things and it doesn't get me anywhere.
"In my opinion it was a terrible tackle and it should have been a red card ... I don't know if they can do anything about it."
The FFA's match review panel had no plans to even assess the incident, as it was deemed referee Strebre Delovski dealt with it by awarding the Heart a free kick.
Didulica said while most observers felt it warranted at least a yellow card, the Heart would respect the sport's convention of considering the referee's decision as final.
"It's a little bit at odds with what happens in other codes in Australia where tribunals or match review panels have the power to intervene regardless of what the referees rule," he said.
"But soccer's a little bit different, the referee's decision on the field always carries significant weight.
"And whilst everyone has views about what the referee should or could have done in those circumstances, the reality is if he's seen it and made a decision there's nothing that our club or the FFA can really do and we respect that."