Sergio Busquets has undergone his PCR tests on Wednesday morning, Cadena SER's Adria Albets reports.
If the 32-year-old tests negative for Covid-19, he'll re-join the Spain squad later today.
The Barca midfielder tested positive for coronavirus two weeks ago and has been self-isolating at his home in Barcelona since then.
Alba can't wait to have Busquets back ahead of Spain's Euro 2020 opener
Jordi Alba was invited to speak in a press conference alongside Luis Enrique ahead of Spain's Euro opener on Monday.
"All the players are used to playing every three days. We are ready. In every national team, it's the same. We're all ready. I'm very good and looking forward to helping the team," Alba said regarding Spain's readiness for the tournament.
"The idea we have in every tournament is to win it. There's a lot of competitiveness in all the teams and it's not easy to win. We have a team with a lot of quality and a great group of people. We will try to play a good role in this European Championship."
Spain kicks off their Euro 2020 campaign against Sweden on Monday.
What Busquets' Covid situation means for Spain: explained
The Barca player left the national team in an ambulance and went home to self-isolate despite showing no symptoms, according to Mundo Deportivo.
5 other Spanish players are said to be self-isolating. They train individually.
On Thursday and Friday, Busquets will take the PCR tests to find out whether he'll be able to play at Euro 2020.
Of course, the test results of those training individually matter too. If something goes wrong, Luis Enrique may be forced to replace the Covid-infected players before the tournament kicks off.