The former Netherlands manager took over from compatriot Jo Bonfrere a little over two weeks ago, becoming the third Dutchman in less than five years to take charge of South Korea.
Despite guiding the South Koreans to their sixth consecutive World Cup, Bonfrere stepped down following a string of poor performances since securing their spot in Germany. Guus Hiddink led the team to the 2002 World Cup semi-finals.
"I have a lot of confidence in this team," Advocaat told a news conference on Friday.
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"It's a very positive thing that we are four years further on and that there are five or six players playing in Europe in a very strong competition".
Experienced players such as Park Ji-sung at Manchester United and Tottenham's Lee Young-pyo would be important, but everyone had to prove themselves, added Advocaat.
"It doesn't matter how old you are or who you are. It's only important that you have the quality to compete at the highest level".
Advocaat, who led the Netherlands to the semi-finals of Euro 2004 in his second spell as coach, has only eight months to get to know the players before the finals.
Seeing as much of them as possible on the training ground and in a competitive environment was essential, he said.
"Players have to show us what they can do in games and on the training ground," the 58-year-old added. "If you don't have what we want, we will pick another player. Players who are not working stay at home".
The former Rangers and PSV Eindhoven manager also asked to be given a fair crack of the whip, calling for fans and the media to get behind the team and help the players regain some of the confidence lost during Bonfrere's tenure.
The South Korea job has become something of a poisoned chalice since Hiddink's reign with former Portugal coach Humberto Coelho also stepping down amid intense pressure.
"It's very important for players to get their confidence back," he said.
"Everyone is very much focused on results now, but its more important for us that we get results in Germany".
Advocaat's first match in charge will be a friendly against Iran in Seoul on October 12.
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