Luis Rego said euro zone countries would be able to make their bids from Jan. 21 for Praet's position on the ECB's executive board, which will become vacant from June.

Finance ministers from the 19 countries using the euro will choose from among the candidates. If a vote is needed, the winner must get what is called a reinforced qualified majority, with at least 14 out of the 19 voting in favour, representing at least 65 percent of the population of the euro area.

The candidate will then go for a hearing in the European Parliament, which issues its non-binding opinion. The parliament's negative opinions have been ignored in the past.

The candidate will be formally appointed by EU leaders at a summit on March 21-22, in a qualified majority vote, reflecting the economic size and population of the voters.

While no candidates have yet been put forward, euro zone officials often mention Ireland's central bank governor Philip Lane as front runner for the job.

(The story corrects the Eurogroup voting method from simple majority to reinforced qualified majority in paragraph 3)

(Reporting By Jan Strupczewski; Editing by Janet Lawrence)