The club said in a statement Saturday that they had conducted a further round of tests Friday
Lazio, already deprived of several players, announced Saturday that they had put their entire squad in quarantine after positive novel coronavirus tests.
Lazio fielded a depleted team in Club Brugge in the Champions League Wednesday and drew 1-1 without last season's top European scorer Ciro Immobile and midfielders Luis Alberto, Manuel Lazzari, Lucas Leiva and Djavan Anderson.
The club said in a statement Saturday that they had conducted a further round of tests Friday.
It is the first time Lazio have explicitly confirmed cases of Covid-19 in their squad after talking about "doubtful" tests during the week, even though it omitted players from its squad.
Lazio are 12th in the Italian Championship and travel to Petersburg to play Zenit in the Champions League Wednesday.