WASHINGTON - The International Monetary Fund's board on Monday blocked Bank of Israel governor Stanley Fischer from the race for the top IMF job, further boosting the chances of French Finance Minister Christine Lagarde.

Fischer, who was born in what is now Zambia and carries both an American and Israeli passport, announced his last-minute candidacy over the weekend, saying he had been encouraged by a number of emerging economies. Applications were due by Friday.

Board officials told Reuters previously the IMF rules could easily be changed if there was enough support for Fischer.

In a surprise move, the IMF board rejected changing the IMF's rules that would have allowed 67-year-old Fischer to run, two board official told Reuters. IMF rules stipulate an age limit of 65 for an incoming managing director.

The officials said changing the rules for Fischer would have required a reopening of the selection process to allow other candidates older than 65 to participate in the race.

An IMF board statement issued later confirmed it had shortlisted Lagarde and Mexico's central bank chief Agustin Carstens and would consider their nominations but made no mention of Fischer.

"The executive board will meet with the candidates in Washington and, thereafter, meet to discuss the strengths of the candidates and make a selection," the board said.

It reiterated that it planned to complete the selection by June 30.

Front-runner Lagarde is backed by the European Union and a handful of other countries including Indonesia, the first large emerging market to declare its support for her.

Carstens has the support of a dozen Latin American countries, including Colombia, in a race which, despite being one of the most hotly contested in IMF history, is widely expected to result in Europe maintaining its 65-year grip on the job.

Carstens acknowledged on Monday during an appearance in Washington that he was a long-shot candidate and he knew chances were "quite high" that Lagarde would get the job left vacant by Dominique Strauss-Kahn, who was arrested in New York in May on sexual assault charges. He has denied the charges.

The European debt crisis made it hard to break the tradition of European leadership at the fund, even though members agreed some time ago the next managing director should be selected on the basis of merit, Carstens said.

"That makes it more difficult. I'm not fooling myself. It's like starting a soccer game with a 5-0 score," Carstens said after a meeting with US Treasury Secretary Timothy Geithner.

In a statement, the US Treasury Department said it had not yet endorsed a candidate, although it is widely expected that Washington will back Lagarde to head the global financial institution.