The Koreans are the only team to reach the last four with an unblemished record of four wins from the matches they have played so far and Kim sees no reason to change in the lead up to the semi-final.

A 101st minute goal from Al Hassan Toure took the Australians into the last four of the competition for the first time and keeps alive their hopes of a place at the Finals of the Olympic Games, although Arnold stressed his side is focused on the title rather than securing a trip to Tokyo.

Three of the four teams will earn tickets to Tokyo 2020 with Uzbekistan the most impressive side in the quarter-finals, with the defending champions coming from behind to storm past a strong United Arab Emirates 5-1 in their last eight tie.

Lee Dong-gyeong's sublime free-kick in the fifth minute of added time gave Korea Republic a last-gasp win over a brave Jordan, while Saudi Arabia advanced thanks to Abdullah Al Hamdan's 78th minute penalty against Thailand.

Australia needed extra time to see off Syria, with substitute Al Hassan Toure scoring in the 101st minute to take the Olyroos through. the-AFC.com takes a look at what awaits in Wednesday's semi-finals.

The four teams advanced to the semi-finals in contrasting fashion, with Korea Republic having a perfect record of four wins while Saudi Arabia dropped points against Qatar in the group stage.

Australia have two wins and two draws to their name while defending champions Uzbekistan turned on the power in the quarter-finals against United Arab Emirates but are the only semi-finalists to have already suffered defeat in the competition. Join the-AFC.com's Rhysh Roshan Rai as he analyses the semi-finalists.

Bronze medallists in London 2012, Korea Republic have featured in every Olympics since Seoul hosted the 1988 Games and Cho, who turns 22 on Saturday, wants to celebrate his birthday by helping the East Asian side confirm qualification by winning Wednesday’s AFC U23 Championship Thailand 2020 semi-final against Australia.

The top three teams in Thailand 2020 will join Japan as Asia’s representatives in the Tokyo Games and Cho is determined to help see Korea Republic past Australia - which will seal qualification - before aiming for the title in Sunday’s final.

After being introduced to the action at half-time, Lee Dong-gyeong stroked home a late free-kick to win the game for the East Asians who had been forced to hold off a late Jordanian rally.

With a last four encounter against Australia now awaiting Korea Republic, Kim declared that he had always intended to turn to his bench as the game progressed.

Regulation time failed to break the deadlock and it took a moment of magic from substitute Al Hassan Toure in the 102nd minute for the Olyroos to claim a 1-0 victory to advance to their first AFC U23 Championship semi-finals.

Arnold, who also manages the Socceroos, acknowledged the difficulty his side faced and revealed he was forced to make several strategic adjustments through the 120 minutes and praised his players for their ability to adapt.