Socceroos' $10 million man Leckie surprises himself

Mathew Leckie has been one of Australia's best in Brazil (Getty)

Australia's rising star Mathew Leckie says he's surprised himself with his standout displays at the 2014 World Cup in Brazil - with pundits now estimating his worth at about $10 million.

He's also surprised just how rapidly his stocks have risen, a month after signing a $1.1 million contract with German second division club FC Ingolstadt.

The attacking winger could now command a market price much higher but doesn't regret signing the deal before the World Cup started.

"I didn't know what was going to come at this World Cup," Leckie told reporters.

"I always say that everything happens for a reason.

"So whether I could have maybe had other offers now after this World Cup if I hadn't signed, I never would have known."

Leckie dash and dare has, along with Tim Cahill's goals, been the highlight of Australia's campaign that ends with its last group match against Spain in Curitiba on Tuesday (AEST).

The 23-year-old said his eye-catching performances, and those of Australia, caught him by surprise.

"The whole team as individuals have all surprised ourselves a little bit," he said.

"For me, I definitely didn't think we would compete this well with the teams we have played.

"There have been times, especially the Holland game, we dominated areas of the game - to lose that game was very harsh.

"The way we have played ... no one expected it.

"I think the whole world expected us to come here and just put 10 men behind the ball and hope to pinch results.

"Although we haven't got the results, the way we have gone about it and the way we have played is something very exciting for the country."

Leckie dismissed talk of Australia's encounter against defending champion Spain as being a dead rubber, with both nations winless and to exit the tournament after the clash.

"Ange pointed out to us that we have only won two games in the World Cups that we have been a part of," he said.

"So for us to get a win, but also win against Spain, a team that were World Cup winners four years (ago), that will be a massive achievement for the country."