Euro zone sentiment improved for a sixth month in a row in February with expectations rising to their highest level since June 2007, before the financial and debt crises, Sentix said.

The research group said its monthly index tracking investor sentiment in the euro zone climbed to -3.9 in February from -7.0 in January, compared to forecasts of -3.0.

''The overall index shows that the euro zone economy is about to grow again," Sentix said in a statement. It added that it expected the index to move into positive territory soon, probably next month.

"Investors have needed quite a long time to recognise that since last summer a fundamental and positive change has taken hold," it added.

A sub-index of expectations rose to 15.8 in February, its highest level since June 2007, from 12 in January. Current conditions rose to -21.8 in February from -24.3.

A separate index for Germany showed sentiment rising to 24.3 in February, its highest level since July 2011 and up from 17.7 with expectations jumping to 22.1 from 14.6.