FRANKFURT -- Japanese investors should have full confidence in the stability and strength of the euro as the currency is launched in its physical form at the start of next year, according to the European central banker coordinating the project.

Eugenio Domingo Solans, one of the five members of the European Central Bank's executive board, gave an unwavering message of confidence during an interview in his office atop the ECB's tower in Frankfurt.

Responding to fears among Asian investors that the euro -- which has depreciated against other key currencies since its inception at the start of 1999 -- will remain weak, making the euro-zone assets less attractive, the central banker was adamant.