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living in a good moment of tourism,” said Manuel Caldeira Cabral.

But there are concerns that Lisbon and Porto are ill-equipped to bear the brunt of the surge.

“Infrastructure isn’t keeping up,” said Trish Lorenz, a journalist who lives in Porto. “There are huge queues for tickets at railway stations and standing room only on public transport. Issues around noise and litter mean locals are fed up. In both Porto and Lisbon, the central downtown areas have become more or less only for tourists.”

Mary Lussiana, Telegraph Travel’s Portugal expert, said, “Lisbon is suffering the most, with the narrow cobbled streets so crowded with tourists, particularly in areas such as Chiado, that it is hard to walk around. Locals talk of an invasion.”

Mr Cabral said Portugal was coping with the growth but that the tourist board was working to encourage travel outside the peak summer season and to lesser-known destinations.