Famke Krumbmuller said the result of the German election results meant it could be difficult for the French president to drive his agenda, which includes the idea that Britain will re-join the Brussels bloc.
Mr Macron said in a major speech in Paris yesterday that post-Brexit Britain could still have the option of being part of a reformed European Union “in a few years”.
But Angela Merkel’s CDU/CSU union won a hollow victory as Germany’s largest party but fell more than 100 seats short of an overall Bundestag majority, leaving the Chancellor scrambling for a coalition.
With her options reduced, the most likely outcome at this stage is a ‘Jamaican Coalition’: one made up of the black emblem of the CDU/CSU, the green of the Green Party and the yellow of the Free Democratic Party (FDP).
Speaking on Al Jazeera, Ms Krumbmuller said the new coalition could impact reform of the EU.

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She said: “From Macron’s perspective on eurozone reform, the liberals are quite sceptical on a lot of the issues that he wants to reform.
“So they will be a more difficult partner. On the other hand, we have the Green party who’s staunchly pro-European, a bit more left leaning, closer to Macron maybe on that front as well.
“They could counter balance to a certain extent the liberals in Germany.”
A messy three-party partnership could cause Mrs Merkel several headaches, with the different groups split on several issues.
Open borders, a policy championed by Mrs Merkel during her third term as Chancellor, will act as the headline issue.
While the CDU/CSU are finally acknowledging a need to toughen border controls, the FDP are opposed to any change.
The Greens also reject any increased controls.