(Updates with Slovakia PM on exchange rate)
By Jan Strupczewski
BRUSSELS, June 19 (Reuters) - Slovakia will seek a strong conversion rate of its currency into the euro, its prime minister said on Thursday after European Union leaders gave his country the green light the euro zone on Jan. 1, 2009.
Left-wing Robert Fico said Slovakia wanted the strongest possible exchange rate for its crown currency into the euro, when it would be set in July by EU finance ministers, but not one that would harm economic growth.
"We want the strongest possible conversion rate ... that people can pay as few crowns as possible for the euro," he told reporters at an EU summit in Brussels.
"But too strong a conversion rate could reduce economic growth. We would like to keep economic growth at the highest possible level and the people to profit from it (the conversion rate) as much as possible."
The Slovak crown rose against the euro <EURSKK=> on Fico's remarks to 30.285 from 30.355, according to Reuters' data.
The EU's 27 leaders earlier approved as expected Slovakia's bid to the euro zone's 16th member, despite European Central Bank concern over the country's inflation.
"We have the euro. Definitely. This is a big success of Slovakia, because it met all the criteria in difficult times of food and oil price rises," Fico said.
Analysts say that a strong conversion rate will help Slovakia fight inflation. Fico has said it will also make the country's 5.4 million citizens richer when their salaries are translated into euros.
The EU leaders concluded, as recommended by the executive European Commission, that Slovakia met all euro entry criteria on inflation, interest rates, budget deficit and currency stability.
Slovakia will become the fourth of the bloc's new members that have joined the EU since 2004 to adopt the euro. Much smaller Slovenia entered the single currency zone in 2007, followed by Cyprus and Malta this year.
Bigger EU newcomers Poland, the Czech Republic and Hungary are expected to adopt the euro well after 2010.
LEAK ALLEGATIONS
EU finance ministers will on July 8 give the final blessing for the ex-communist country's euro adoption by setting the final exchange rate between the Slovak crown <SKK=><EURSKK=> and the single currency.
Slovakia's euro entry process has been clouded by opposition allegations this week that the government may have leaked information that moved the currency market ahead of a crown revaluation in May.
Slovakia strengthened the crown's central parity rate last week in the ERM 2, an exchange rate system that is a stability test for the euro, by 15 percent in local terms and 17.6472 percent in international terms to 30.1260 to the euro.
Slovak Finance Minister Jan Pociatek has denied the allegations. But Fico has criticised him for meeting socially on a yacht in Monaco one of investors who had bought crowns heavily ahead of the revaluation.
EU finance ministers had previously brushed aside ECB concerns about the country's ability to keep inflation low in a sustainable way, a vague euro entry criterion.
Slovakia has pledged extra fiscal tightening should inflation prove higher than it now expects. (Writing by Marcin Grajewski; Editing by)