The European Central Bank will need to keep raising interest further though most of the tightening has already been done, ECB's Vice President Luis de Guindos said on Thursday.

"A significant part of the journey has been made, there is still some way to go, probably the road ahead is shorter, but I don't know what the end point is going to be," De Guindos told a financial event in Madrid.

The ECB slowed the pace of its interest rate increases earlier this month with a 25-basis-point raise but signalled more tightening was coming. (Reporting by Jesús Aguado and Emma Pinedo; editing by Inti Landauro)