Britons travelling to the Balearic islands will need to show either a negative PCR test or proof they have been fully vaccinated against the coronavirus, Spain’s prime minister, Pedro Sánchez, said on Monday. The rules – which come into effect on Friday – were announced two days before the Balearics are due to move on to the UK’s green list for quarantine-free travel, and amid growing concerns over what Sánchez called “the negative evolution” of the virus in the UK. Spain had planned initially to let British visitors enter the country without the need for a negative PCR test, but pressure has been mounting on the central government following rising case numbers in the UK and clusters of cases in Spain that were traced back to an end-of-year school trip to Mallorca. “We’ve been seeing a negative evolution of the accumulated incidence in the UK over recent weeks,” Sánchez told Cadena Ser radio. The number of cases per 100,000 people over the past week stands at 123 in the UK and 46 in Spain. “We’re going to apply the same requirements for British tourists in the Balearics that we apply to those from the rest of Europe,” the prime minister added. “They will need to be fully vaccinated or have a negative PCR test to travel to the Balearics. This will take effect in 72 hours so that tour operators and British tourists can adapt to this new rule.” Spain’s foreign minister, Arancha González Laya, later explained that the entry requirements would be published in the official state gazette on Tuesday, and come into force three days later. She also suggested the new rules would apply to the whole of Spain and not just the Balearic islands. The regional government of the Balearic islands – the only part of Spain to be included on the green list – had expressed concerns over rising case numbers in the UK and called for “strict and safer entry controls” for UK visitors. “We’ve made huge efforts to get here and the state needs to protect the strong health situation in the Balearic Islands,” the regional president, Francina Armengol, tweeted last week. Although Spain is gearing up for the summer season and recently revoked its rules on wearing masks outdoors, the more contagious Delta variant and the 600 new cases traced back to the school trip have set alarm bells ringing. Spain has logged a total of 3,782,463 Covid cases and registered 80,779 deaths. More than half of the country’s 47 million people have received a single dose of the vaccine, while about a third – 15.9 million – have received both doses. On Sunday, the Portuguese government announced that British visitors would have to quarantine for two weeks on arrival if they were not fully vaccinated against Covid. The rule – which will remain in place until at least 11 July – stipulates that Britons arriving by land, air or sea must show evidence they are fully vaccinated or self-isolate for 14 days at “home or at a place indicated by health authorities”. The move came as case numbers in Portugal continued to surge, putting the number of new daily infections back to February levels, when the country of just over 10 million was still under a strict lockdown. Health authorities have blamed the Delta variant, which was first identified in India but is now spreading rapidly in Britain, for the recent rise in infections. More than 70% of Covid-19 cases in the Lisbon area are from the Delta variant. The UK government removed Portugal from its green list earlier this month and put it in the amber category.