The Portuguese international, 21, is now isolating at home and will begin a period in quarantine – the news comes just four days after team-mates Yannick Carrasco and Mario Hermoso also tested positive for COVID-19.
Carrasco and Hermoso missed LaLiga leaders Atletico’s 4-2 win at Cadiz on Sunday, but club record-signing Felix started and played 60 minutes yet will now be unavailable for Monday’s clash at home to Celta Vigo.
A short club statement read: ‘Our player Joao Felix have tested positive for COVID-19; He is isolated and serving quarantine at home.’
Felix, who moved to Atletico from Benfica for a club-record £113m, has made 25 appearances for Diego Simeone’s side in all competitions this season, scoring nine goals.
However, the striker had scored just once in his last 11 league outings – nonetheless, Atletico are currently on a win-streak in the league of eight games.
After their weekend win against Cadiz, they are 10 points clear at the top-of-the-table from second-placed Barcelona, with a game in hand