Atletico Madrid Los Colchoneros is looking for a solution

EFE
Atletico Madrid’s Champions League round of 16 first match against Chelsea will not be played in the Spanish capital.
This is due to the extension of restrictions on incoming flights from the UK, as well as South Africa and Brazil, which are preventing the Spanish government from preventing the Blues from making such a trip.
Travelers from the three above-mentioned countries are prohibited from entering Spain without a ten-day quarantine if they are not nationals or residents of Spain or Andorra, due to the apparent variants of coronavirus detected.
As a result, Los Colchoneros strives for alternative venues, with Bucharest the most likely city to host the match.
Countries such as Belgium, France, Portugal and Germany are excluded because they have also introduced the same measures as Spain.