The European Central Bank (ECB) still plans to take action to combat the problem of low and falling inflation despite holding off and disappointing markets over the past few months, Portugal's finance minister told CNBC.

Maria Luís Albuquerque forecast the central bank would soon instigate monetary easing to boost inflation, highlighting ECB President Mario Draghi's insistence at his last news conference that the use of "unconventional" policies was still under consideration.