Choi, who has joined Adelaide United as an injury replacement, made his debut as an 87th minute substitute in United’s 2-1 loss to Melbourne Victory last round.

The South Korea-born winger is in line to start in Friday night’s clash following injuries to Sergio Cirio, Marcelo Carrusca and most recently Henrique.

Only a few months ago, Choi was plying his trade in the New South Wales NPL with Blacktown City before catching the eye with an unbelievable long-range goal in the FFA Cup.

He followed that up with a stunning strike in the NSW NPL Grand Final, leading to his A-League opportunity.

“No, it’s unbelievable,” Choi said when asked about the prospect of debuting against Cahill.

“Hopefully I’m able to start a game. We’ll see how I go. I’ll just work hard in training.”

The quietly-spoken 21-year-old almost netted a late winner against Victory, before Marco Rojas’ decisive strike.

“I thought it was going in. It hit the post, it was unlucky,” he said.

“I didn’t get too much game-time but I was happy to get on the field. It was great to debut.”

Choi was full of praise for the United coaching staff and acknowledged moving from the NPL to A-League was a significant step-up.

“Training is the biggest step-up,” Choi said.

“We train every day. The high intensity, after training I’m always tired.”