"If someone in Berlin or Brussels thinks of dropping dozens of migrants via non-authorised charter flights in Italy, they should know that there is not and there will be no airport available," Salvini said on Twitter Sunday.
"We will close the airports like we closed our ports," he added in reference to Italy's decision this summer to ban migrant rescue boats from entering its harbours.
Similarly, Italian newspaper La Repubblica reported Saturday that Germany's federal migration office was sending letters to asylum-seekers, warning them of their "imminent" return to Italy under the so-called Dublin rules.
That controversial regulation assigns responsibility for migrants to the nation of first entry.
However, Germany's interior ministry told DPA later Sunday that "no deportations (of migrants) to Italy are planned in the coming days".
Immigration remains a hot-button issue among European Union members despite a major drop in arrivals following the 2015 peak of the continent's migration crisis.
Salvini, whose far-right Northern League party forms a ruling coalition with the anti-establishment Five Star Movement, accuses other EU members of letting Italy shoulder an unfair share of migrants.
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