Inflation jumped to 6.8 percent in October from September's 6 percent, due to strong pressure from food prices and energy rises, boosting expectations for a rate increase next year.
The central bank raised interest rates by 50 basis points to 7.5 percent at its board meeting on Oct. 31, reversing some of the monetary easing earlier this year.
"Probably, in the second half of 2008 we will see inflation returning within a variation band of below 5 percent if monetary policy rates are increased," Juan Jose Fernandez-Ansola, the Fund's representative to Romania and Bulgaria was quoted by state news agency Rompres as saying.
Fernandez-Ansola, who said inflation remains a problem in the new European Union member, said the central bank would need support from fiscal policies to fight price rises.
"From a legal point of view, the bank is responsible for containing prices at low levels ... but if it will be left (to do this job) alone ... this can turn into a difficult problem for the country given that half of what happens in the Romanian economy is controlled through fiscal policies."
The central bank raised its annual inflation forecast last month to 5.7 percent in December from 3.9 percent previously, citing higher food prices and a worsening outlook for the local leu currency.
The bank targets inflation at 3-5 percent this year and 2.8-4.8 percent next. (Reporting by Radu Marinas; Editing by Gerrard Raven)