UPDATE 3-Chavez warns may shut off Venezuela oil to Europe

(Adds detail, background, new Chavez comments)

CARACAS, June 19 (Reuters) - Venezuelan President Hugo Chavez threatened on Thursday to stop selling oil to European countries if they apply a new ruling on illegal immigrants that is heavily criticized in Latin America and by human rights groups.

European Union lawmakers ruled on Wednesday that illegal immigrants can be detained for up to 18 months and face a reentry ban of up to five years.

"We can't just stand by with our arms crossed," Chavez said at an event to celebrate his OPEC country's oil supplies to South America attended by Paraguay's visiting president-elect, who also criticized the law.

"Venezuelan oil will not go to the countries that apply this shameful directive. I'll say it now, Venezuelan oil will not go," Chavez said.

The socialist ally of Cuba also threatened to expel investments made by such countries, warning he would draw up a list of their business in the OPEC member nation.

"We are ready to do this now," he said. "Here in Venezuela at least, they won't be missed."

Chavez has already nationalized several foreign companies in Venezuela, turning them into joint ventures controlled by the state.

He called on other leaders in the region to take action against the law. Millions of Latin Americans live in Europe, many from poor Andean countries and war-weary Colombia.