Atletico Madrid coach Diego Simeone has tested positive for Covid-19, the club announced.
"The analysis of these new samples in the laboratory has determined that our trainer, Diego Pablo Simeone, has given a positive result for Covid-19," read the club statement.
"Fortunately, our coach does not present any symptoms and is at his home isolated and fulfilling the corresponding quarantine after being with the team since last Monday."
Simeone was absent from training earlier today.
Atletico's first LaLiga match against Granada is not scheduled to be played until September 27 as the club have been given extra time off before starting the season.
Simeone took the helm of Atletico Madrid in 2012 and helped his team claim two UEFA Europa League titles and as many UEFA Super Cup trophies.