Sweden left Kulusevski, who plays his club football for Juventus, in Stockholm when they travelled to Gothenburg for the final part of their build-up to the tournament.

“This morning, Dejan Kulusevski informed the medical team that he had cold symptoms. Dejan was tested immediately and that test was positive,” team doctor Anders Valentin told the Swedish FA website.

“Dejan has since been kept in isolation from the rest of the group and did not travel with us to Gothenburg.”

Later on Tuesday, the FA said Mattias Svanberg had also tested positive and that he had been isolated from the rest of the squad while the test results were being analysed a second time and new tests were carried out.

Sweden head coach Janne Andersson said no reserve would be called up and hoped Kulusevski would be able to rejoin the squad after their Group E opener against Spain in Seville on Monday.

“It’s extremely unfortunate that it (the virus) got in (to our camp). It’s sad for Dejan and sad generally,” Andersson told a news conference.

“It’s impossible to get away from - it creates some concern, at the same time we are handling it as we should, and I have confidence in our doctors.”

Spain have set up a “parallel” squad of 17 reserves for Euro 2020 who may have to play if the Covid-19 infections among its players spread, team management said on Wednesday.

In a decision announced just hours after Spain defender Diego Llorente became the second player to test positive for Covid-19, the Spanish football federation (RFEF) announced in a statement posted on its website that it was setting up a “parallel bubble”.

The RFEF said it had called in 11 players to join six backups who were already acting as cover for the coronavirus-hit first-choice squad.

Captain Sergio Busquets tested positive on Sunday, just a week before Spain open their Euro campaign on Monday, playing Sweden in Group E in the southern city of Seville. Sweden’s squad has also been hit by infections, with two players, star forward Dejan Kulusevski and midfielder Mattias Svanberg, testing positive, its federation said Tuesday.

Since Busquests tested positive, Spain’s entire Euro squad has been in isolation.

The 11 newcomers were part of an Under-21 team that thumped Lithuania 4-0 on Tuesday evening in Spain’s final warm-up match ahead of the Euro.

“The coaching staff of Spain’s national team have decided 11 internationals initially called up for the match against Lithuania will remain part of the senior national team,” it said.

“This group of internationals will join their teammates... within a parallel bubble, created in anticipation of the possible consequences that could result from the positives of Sergio Busquets and Diego Llorente.”

The players are Alvaro Fernandez, Oscar Mingueza, Marc Cucurella, Bryan Gil, Juan Miranda, Gonzalo Villar, Alejandro Pozo, Brahim Diaz, Martin Zubimendi, Yeremy Pino and Javi Puado.

They join six players already drafted in by coach Luis Enrique as insurance against any more positives among his squad: Rodrigo Moreno, Pablo Fornals, Carlos Soler, Brais Mendez, Raul Albiol and Kepa Arrizabalaga.

The 17 reserves in their separate bubble will have no contact with the main Euro 2020 squad.

Players on the first-choice squad were all to be vaccinated against Covid-19 later on Wednesday, the Spanish sports ministry said.

Spain are also scheduled to play Poland and Slovakia in Group E, with all their group stage matches at the Cartuja stadium in Seville.

Agencies