Undated (AP) _ Ruud Gullit walked out of the Netherlands' training camp on Monday and said he won't play with the Dutch team in this summer's World Cup.

Gullit said at a news conference at Noordwijk, Netherlands, that he won't give a reason for his departure until after the World Cup. With Gullit sitting next to him, Dutch coach Dick Advocaat said he regretted the decision and didn't know what was behind it.

''Everybody has to make decisions, but I think he has chosen a bad time to do it,'' teammate Ronald Koeman said. ''He's a very important player, but we must now go on.''

Gullit, 31, returned to his home in Italy on Monday with Marco Van Basten, his teammate on the national team and AC Milan, who is missing the World Cup because of an ankle injury.

Gullit had returned to the national team Friday after a 13-month absence and played in a 3-1 victory over Scotland. He hadn't played for the Netherlands since April 28, 1993, because of disagreements with Advocaat but the two patched up their differences this spring.

Gullit played the second half Friday, galvanizing the Dutch side into its best form in months, and set up Bryan Roy's opening goal.

After the match, Gullit criticized the attacking Dutch strategy, saying the team would have to play more defensively in the World Cup. Advocaat responded by saying that he, not Gullit, was responsible for tactical decisions.

Gullit has played 65 games for the Dutch national team and was captain of the team in 1988 when it won the European Championship. He made his international debut in 1981.

Gullit scored 15 goals this season for Sampdoria of Genoa, then returned to AC Milan, the team he played for from 1987-93.

In other World Cup news Monday, Belgium lost 1-0 to FC Sete of the French third division, prompting criticism for Belgium coach Paul Van Himst.

''With such a mentality, no team in the world can win,'' Van Himst said. ''There is just no excuse for all this.''

Belgium is training in high altitude in the Pyrenees' town to Font-Romeu in southern France until Thursday. The team plays Zambia on Saturday and Hungary on June 8, both in Brussels, and on June 10 travels to Ormond Beach, Fla.

Luc Nilis, a Belgian forward who scored 25 goals for Anderlecht last season, agreed Monday to a three-year contract with PSV Eindhoven of the Netherlands.

Nilis, 27, has played eight seasons for Andelecht, winning four league and three Belgian Cup titles. He hasn't scored in 23 international games.

In Yaounde, Cameroon announced 42-year-old Roger Milla will be part of its World Cup team. Milla came out of retirement to join the Indominatable Lions for years ago, and scored four goals as Cameroon became the first African team to reach the quarterfinals.

Cameroon's team includes George Mouyeme of Troyes, the leading scorer in the French second division, Jean-Jacques Misse Misse of Charleroi in Belgium, David Embe of Bellense in Portugal, Patrick Mboma of Auxerre in France and Jean Jacques Etame of Strasbourg in France.

In Olso, Norway coach Egil Olsen announced his roster and selected 23-year- old Dan Eggen of Brondby IF in Denmark, who has played with the national team just once.

''During the winter I toyed with the idea,'' Eggen said. ''But after a while I wrote off the World Cup trip, and hadn't even thought about it recently. That makes the news very good.''

In Lagos, Nigeria announced its World Cup team, including star forward Rashidi Yekini and defensive stalwart, Stephen Keshi, the team's captain. Also among the 22 are midfielder Austin Okocha of Eintracht Frankfurt.

In Bologna, Italy, Brazil was the overwhemling favorite to win the World Cup in a survey of Italian sportwriters.

Guerin Sportivo, a weekly sports magazine, said 52 of 100 writers surveyed predicted Brazil, 27 predicted Italy and 11 predicted defending champion Germany.

Roberto Baggio of Italy and Romario of Brazil were picked as the potential stars and leading scorers.

In Mexico City, coach Miguel Mejia Baron said Sunday's 2-1 victory over Dutch champion Ajax Amsterdam was ''good training.''

''We have to try to improve some things that were done well but which could have been done better,'' he said.

He said Ajax's defensive tactics were the same type that will be used during the World Cup.

''This will be something that will be revived against Norway, Italy and Ireland,'' he said.