Speaking at a conference on the next long-term EU budget, that will start in 2021, Oettinger also said that while there could be a special line in the overall EU budget dedicated to the euro zone, there should be no separate euro zone budget.

"We don't need 2 percent of European GDP, but a little more than 1 percent. I am talking today of 1.1x and I ask you to help get majority-backing for this in your parliaments and among the public," Oettinger told the conference.

(Reporting By Jan Strupczewski and Philip Blenkinsop)