Australian defender H. Souttar: "It is an unbelievable achievement" © Reuters

Australia returns to the World Cup knockout stage after a 16-year hiatus. After a 1-0 victory against Denmark, the "Socceroos" secured the second place in the group and will face the Argentina national team in the knockout stage.

One of the key Australian defenders, Harry Souttar, expressed pride in his team after the match.

"It's unbelievable, the whole performance today from start to finish, the boys really put in the effort.

"I am very proud and happy for the players, coaches, staff, fans, families, there is an incredible emotion, pride, I could name and name all the words, it's unbelievable.

"It was a tough match. They had good chances to score, we needed luck at the beginning of the first half, I think we didn't start the game well," said the "Stoke City" center-back.