The president of the European Central Bank (ECB), Mario Draghi, says the bank stands ready to give the eurozone further economic stimulus “should it become necessary”.
The comments boosted shares in Europe.
The bank began an asset purchase programme last month, but has come under pressure to do more to boost weak economic growth in the eurozone.
The ECB’s regular policy meeting left interest rates unchanged at their record low of 0.05%, as expected.
On Tuesday, the European Commission cuts its growth forecast for the eurozone to just 0.8% for this year, down from a previous estimate of 1.2%.
The commission also cut its growth forecast for 2015 to 1.1% from 1.7%.