The South Korean World Cup squad have just returned from a gruelling five-week tour that has included nine games in Asia, the Middle East and the United States.

He said the trip was a risky venture that included more games than any coach would reasonably ask players to undergo in such a short time. But with time running out ahead of Germany, he said the risk was necessary and paid off handsomely.

"To be honest we have a very good feeling about the last five to six weeks. Travelling with the team, playing with the team and spending every day with each other," he said.

Advocaat told a press conference that he had yet to settle on a final South Korean squad for the World Cup.

He took a 32-strong squad on the five-week tour which resulted in five wins, three defeats and one draw. But he said that no player was guaranteed a place in Germany.

"Everything is still open," he said. The coaching staff will be monitoring the domestic league and foreign-based players prior to the team's departure for Europe in mid-May, he said.

"If the form is not there it will be very dangerous for them," he added.

South Korea play their final friendly international here on Wednesday against fellow qualifiers Angola.

The South Koreans open their World Cup Group G account against African debutantes Togo in Frankfurt on June 13. The group also includes 1998 champions France and Switzerland. Advocaat said that Angola and Togo were similar sides and the friendly on Wednesday would be a useful exercise.

"It will give us an idea of what we can expect in the first game in June," said Advocaat.

The former two-times Dutch national coach was drafted in to head South Korea's World Cup campaign only five months ago. In recent months the squad have made significant progress, he said.

And Lee Young-Pyo, South Korea's defender who plays for Tottenham in the Premiership and was unavailable for the marathon tour, had noticed the difference. Lee is now back with the squad and training for the Angola game.

"Young-Pyo, in training yesterday, said he could see the difference with the players from November and now. And that is the way the staff is feeling too," said Advocaat.