"The Delta variant is more transmissible than other circulating variants and we estimate that by the end of August it will represent 90 percent" of new cases in the EU, she added.
Macron said EU countries must be careful not to allow new variants to spread, adding that the EU was watching developments in Britain, which has seen a steep rise in the weekly reported cases of the Delta variant.
The supply cuts delayed the EU's vaccination drive in the first quarter of the year, when the bloc had initially bet on AstraZeneca to deliver the largest volume of its shots.
The court said in a statement that AstraZeneca must deliver 15 million doses by July 26, another 20 million by Aug. 23 and another 15 million by Sept. 27, for a total of 50 million doses.
But unionists say it contravenes the 1998 peace deal and London has said the Protocol is unsustainable in its current form after supplies of everyday goods to Northern Ireland were disrupted.