Valencia confirmed on Sunday five of the club's players and staff have tested positive for coronavirus, including Argentinian defender Ezequiel Garay.
Valencia said all those affected were "now at home, in good health and obeying self-isolation measures."
"Clearly I've got off on the wrong foot in 2020," Garay wrote on social media. "I've tested positive for the coronavirus, I'm fine and now just listening to the health authorities, at the moment in isolation."