Alfonso Dastis said now was not the time to talk about a potential EU divorce fee and called for more detail on Britain’s vision for post-exit relations between Westminster and the Brussels bloc.
Speaking to Bloomberg, the politician said he had “big expectations” ahead of the Prime Minister’s speech on Brexit on Friday in Italy.
He said: “I don’t think we have to talk about figures right now, we have to agree a methodology, we are waiting with big expectations the speech by Prime Minister May this coming Friday.
“We hope that in the end, we will manage to [gain clarity] – we need some clarity from the UK as to what they really want.
“But as for Spain, we’re clearly determined to make a success out of Brexit.”

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Mr Dastis said a clear position on the issue of single market and customs union membership would be key ahead of further talks with the EU.
He said: “We need to find out whether they are going to, as I think we need, we have to expect if they will accept the transition, whether they will want to stay even for some time in the single market or the customs union.
“And we want to know really that they are determined to achieve the goals of a deep and constructive partnership between the UK and the European Union.”
The comments come despite the Government signalling it wanted to remain in the customs union during a post-Brexit transition period.
Boris Johnson was since criticised for his role in “undermining” the Prime Minister by publishing his own Brexit plan.
Despite the Foreign Secretary’s exit blueprint, he is set to appear next to the Prime Minister as the Cabinet presents a united front when Mrs May makes her speech in Florence.