(Reuters) - At least 11 banks from six European countries are set to fail a region-wide financial health check this weekend, Spanish news agency Efe reported, citing several unidentified financial sources.

The results of the stress tests on 130 banks by the European Central Bank are due to be unveiled on Sunday.

Three banks in Greece, three Italian lenders and two Austrian ones are among those that preliminary data showed had failed the tests, Efe said. It gave no details of how much capital the banks would have to raise and said this could yet change as numbers could be revised at the last minute.

The euro fell on the report. The ECB could not immediately be reached for comment.

Efe also identified a Cypriot bank and possibly one from Belgium and one from Portugal. The exercise is designed to see how banks would cope under various economic scenarios, including adverse ones, and is likely to reveal capital shortfalls at some entities.

The ECB is carrying out the checks of how the biggest euro zone banks have valued their assets, and whether they have enough capital to weather another economic crash, before taking over as their supervisor on Nov. 4.