Chelsea goalkeeper Kepa Arrizabalaga is the latest player to be called up to Spain's back-up training bubble ahead of Euro 2020.
Spain's preparations have been thrown into disarray following Sergio Busquets' positive coronavirus test on Sunday.
The senior squad, who are in isolation, all returned negative tests on Monday but will continue to follow strict protocols before the start of the Euros, with players from the Under-21 squad set to play in Tuesday's friendly with Lithuania.
As a precaution against further positive cases depleting his squad, coach Luis Enrique has created a parallel training bubble with players effectively on stand-by to join the main Euros squad.
Rodrigo Moreno, Pablo Fornals, Carlos Soler and Brais Mendez were first called up to the bubble before defender Raul Albiol was added late on Monday.
Kepa will also join the group, giving Luis Enrique coverage across the positions should any further COVID-19 cases arise.
Kepa made only seven Premier League appearances in 2020-21 after losing his place to Edouard Mendy. The former Athletic Bilbao keeper has 11 senior caps for Spain.