The King’s first state visit of his reign may be disrupted by ongoing French protests against President Emmanuel Macron’s plan to raise the retirement age.
Unions have called for more demonstrations to coincide with the King and Queen Consort’s visit to Paris, due to take place on Sunday.
A banquet at the Palace of Versailles hosted by Mr Macron could be moved or even cancelled, according to local reports.
It is understood the trip’s logistics have been under review for some days, amid massive protests in the French capital.
The unions’ announcement follows a record turnout in Paris against the government’s unpopular bill to increase the retirement age from 62 to 64.
French authorities say 119,000 people marched through Paris on Thursday, believed to be the biggest demonstration in the capital in the current wave of protests.
Police used tear gas to disperse rioters, who threw objects and fireworks towards the officers.
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The protests have sometimes turned violent, while strikes have upended travel across the country, with protesters blocking train stations, the Charles de Gaulle Airport in Paris and ports.
After Paris, the King and the Queen Consort travel to Berlin from 29-31 March.
