Two individuals within Atletico Madrid’s proposed travelling party to Lisbon for the Champions League have tested positive for coronavirus.
The names of the impacted staff members have not been released, but the club have confirmed they are now self-isolating.
Due to the virus pandemic, the 2019-20 Champions League campaign was postponed until the end of the summer, with the final stages set to take place in a mini-tournament in Lisbon over the next week or so.
Atletico released a statement on Sunday confirming their two positive cases.
"Yesterday, Saturday August 8th, all the members of the first team and of the club's Lisbon travelling party were submitted to tests in the Ciudad Deportiva de Majadahonda as per UEFA's protocol to participate in the Champions League quarter-finals,” the statement read.
"Today, two positives appeared among the known results, which are now isolated in their respective homes and were reported immediately to the Spanish and Portuguese health authorities, UEFA, the Royal Spanish Football Federation, the Portuguese Federation and the Superior Council of Sports.
"As such, a corresponding protocol planned for these circumstances has been activated, which requires new tests to be undertaken to first team players, members of the Lisbon travelling party and those who are in close contact with the positive cases, and which will result in changes in the timings of training sessions, in the structure and development of the journey and the accommodation in the Portuguese capital.
"The club will coordinate the new timings with UEFA and as soon as a new plan will be made, it will be made public. We ask for maximum respect towards the identity of the two positive cases."
Following their defeat of Liverpool in the previous round, Atletico have made it to the last eight, with them set to take on RB Leipzig this Thursday.