Ramos is the second case of coronavirus detected in the Real Madrid squad in a week. French defender Raphael Varane tested positive last Tuesday.
Champions League: Real Madrid defender Raphael Varane tests positive for COVID-19 ahead of Liverpool clash
Madrid are already without the injured Sergio Ramos, meaning Nacho Fernandez and Eder Militao are the only fit central defenders left in Zinedine Zidane's squad for the game against Liverpool in the Spanish capital later on Tuesday.
Luis Suarez's flicked finish early in the first half looked to be enough to give Atletico a crucial win that would have put them eight points clear of their opponents, with a game in hand.
LaLiga: Raphael Varane double leads Real Madrid comeback win at Huesca; Sevilla beat Getafe as coaches clash
The victory moved Real Madrid back into second place in the standings, closer to league leader Atlético Madrid.
LaLiga: Atletico Madrid edge past Barcelona to earn title boost; Villarreal hold Real Madrid to a 1-1 draw
Yannick Carrasco finished brilliantly from range after mistakes from Gerard Pique and Marc-Andre ter Stegen left the goal gaping but Barca, and a below-par Lionel Messi, failed to respond at the Wanda Metropolitano.
Champions League: Bayern Munich crush Atletico Madrid 4-0; Real Madrid suffer shock defeat against Shakhtar
Bayern Munich began their defence of the Champions League title in ominous fashion by crushing Atletico Madrid 4-0 on Wednesday, while Liverpool and Manchester City also won but Real Madrid suffered a shock defeat.
World Cup winner Pogba has been replaced by teenager Eduardo Camavinga, who was called up for the first time alongside Lyon midfielder Houssem Aouar and RB Leipzig defender Dayot Upamecano.
Champions League: Manchester City seize on Raphael Varane mistakes to oust Real Madrid, reach quarterfinals
Real Madrid's defensive mistakes by Raphael Varane were seized on by Raheem Sterling and Gabriel Jesus to lead City into a quarterfinal against Lyon.
Real Madrid, who have not won the title since 2017, lead the table on 74 points, four ahead of Barcelona with five games left and have a superior head-to-head record over the Catalans
Copa del Rey: Raphael Varane, Vinicius Junior help Real Madrid outclass Zaragoza to seal quarter-final berth
Real Madrid thrashed a depleted Real Zaragoza side 4-0 on Wednesday to reach the Copa del Rey quarter-finals.
A late strike from Espanyol's Wu Lei stymied a superb performance by Luis Suarez to leave Barcelona tied on points atop LaLiga with Real Madrid at halfway stage of the season
Benzema missed two good chances but got the second goal from close range in the 79th before Madrid defender Ferland Mendy was sent off four minutes later for a second yellow card
LaLiga: Zinedine Zidane drops Gareth Bale from Real Madrid squad for second game running to increase doubts over his future
Gareth Bale will be excluded from Real Madrid's squad for the second match running as Zinedine Zidane continues to suggest the Welshman is not part of his plans for next season.
LaLiga: Real Madrid will have clear first-choice goalkeeper next season, says manager Zinedine Zidane
Real Madrid could sell Thibaut Courtois or Keylor Navas after coach Zinedine Zidane said the club will have a clear first-choice goalkeeper next season.
LaLiga: Santiago Solari still uncertain over Real Madrid future despite victory over embattled Real Valladolid
Real Madrid's losing run is over but Santiago Solari offered no assurances over his future after a chaotic 4-1 victory over struggling Real Valladolid on Sunday.
LaLiga: Barcelona gunning for double over rivals Real Madrid as Atletico aim to keep pace with rampant league-leaders
Atletico Madrid are closer to Barcelona than Madrid with a seven-point gap, and they still have to play Barca in April, albeit at the Camp Nou, where they have not won in 18 visits
Former Arsenal star Santi Cazorla scored twice as Villarreal drew 2-2 with Real Madrid in LaLiga on Thursday, with the pint-sized midfielder producing a late header for a share of the spoils.
Luka Modric wins 2018 Ballon d'Or to end Cristiano Ronaldo and Lionel Messi's duopoly; Ada Hegerberg wins women's award
Modric was crowned after an outstanding year in which he starred in the Real side that retained the Champions League before helping his country to the final of the World Cup.
LaLiga: Real Madrid suffer fresh blow as defender Rafael Varane set to sit out for a month due to thigh injury
Real Madrid defender Raphael Varane is expected to be sidelined for a month with a thigh injury he sustained in the humiliating 5-1 Clasico defeat by Barcelona on Sunday.
La Liga: Luis Suarez's hat-trick helps Barcelona thrash Real Madrid, deal fatal blow to manager Julen Lopetegui
Barcelona ran riot to win the Clasico 5-1 on Sunday as Luis Suarez scored the hat-trick that could spell the end of Julen Lopetegui's time as Real Madrid coach.