The former Conservative MP said a clear consensus was being formed across the EU with how the bloc’s leaders handle its open borders.
German Chancellor Angela Merkel has been forced to come to terms with her conservative alliance’s worst election result for almost 70 years.
She suffered a mauling at the polls, with the far-right, anti-immigration Alternative for German (AfD) entering the Bundestag for the first time.
Speaking on the BBC’s This Week, Mr Portillo said Mrs Merkel’s open-door refugee policy was behind demise at the polls.
He added that feeling continues to reverberate around the European Union’s member states, which could single a collapse to the bloc’s key ideologies.
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“A bit like Theresa May’s result, a rather personal setback because it was Angela Merkel’s policy on allowing in a million refugees that had this repercussion,” Mr Portillo said.
“With this very large vote for the AfD, it is probably going to be months before she can put together a coalition.
“She’s so far short of having a majority with her own party, even aligned with the CSU.
“I also believe that we have almost forgotten the Le Pen result, in France, which also extremely good, even better than AfD.
“I’m struck by the irony that as Britain is leaving the European Union because people are worried about immigration, I think the borders and the boundaries are going to be going up all over the European continent.”
Ms Merkel has vowed to support French President Emmanuel Macron in his bid to reform the European Union after Brexit, as part of what the German Chancellor calls “intense” cooperation between Berlin and Paris.
The pair met half an hour before an EU dinner in Estonia, ahead of a formal summit on Friday, to share ideas.
According to a French aide, Ms Merkel welcomed the French President’s speech as “visionary” and a return of France as a driving force within the Brussels project.
Mr Macron outlined his set of proposed sweeping reforms, which would turn the EU into a two-tier bloc.
Countries willing to integrate within the concept of more Europe could do that, while countries unwilling could state within a less integrated part of the federal state.