The White Eagles, as the Serbian team is known, hope that the 20-year-old can reinforce their squad for the tournament qualifiers.
The Serbs have contacted the Broncos by email, opening a discussion about the player’s international future.
Opacic qualifies for Serbia through his father, who has Serbian blood.
“Tom was a bit surprised (to be approached) but his father has ties to Yugoslavia so eligibility would not be an issue,” his manager Shaun Pyne said, according to the Courier-Mail.
Opacic, who is from the town of Wamuran, has also recently been handed a one-year contract extension by the Brisbane outfit.
“Tom is rapt to have his future sorted, the Broncos say he could be a 10-year player at the club,” Pyne added.
“Last year, Tom had no guarantees but he asked the Broncos if he could train once a week.
“He has turned that into an NRL Auckland Nines trip, a World Club Series trip and now an upgrade for another year.
“He is not a guy who is flashy or oozes skill, but he is tough, defensively solid and a good clubman.’’