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.

Kepa Arrizabalaga made another blunder and Timo Werner missed a penalty but Tammy Abraham's hat-trick got Chelsea past Luton Town with a 3-1 victory at Stamford Bridge.

Abraham's quickfire double put Chelsea in control early in the FA Cup fourth-round tie on Sunday, as last season's runners up seemed to be heading for a comfortable success.

Yet Kepa, brought in as one of seven changes made by Frank Lampard from Tuesday's defeat at Leicester City, enabled Luton to haul themselves into the contest when he failed to keep out Jordan Clark's effort.

Abraham's third goal 16 minutes from time ultimately set up a fifth-round trip to Barnsley, though Werner's woeful run in front of goal continued when his late spot-kick was saved.