Leckie, who's played 16 games this season, shone against Perth Glory despite United's 3-2 defeat.

Vidmar says the first-year player has plenty of room for improvement but is a 'superstar in the making' and may catch the attention of the Socceroos.

"He's not ready for that but funnier things have happened," Vidmar said. "If you want to call it throwing a joker into the pack, he probably ticks all the boxes at the minute.

"He's just got some raw, natural talent and some power, some speed and every time he stands up to defenders and starts running at them, I think in a way they are having a massive panic, because he gets past them very easily.

"There's a few areas he needs to work on, his first touch, his final pass in the front third and if he just gets a little bit more composure in front of goal he's going to be an absolute superstar."