Juventus have announced Federico Bernardeschi has tested positive for COVID-19, ruling him out of Wednesday's crucial game against Napoli.
Bernardeschi is isolating away from the rest of the first-team squad following the test result, though Juve revealed on Tuesday that the Italy international is asymptomatic.
The 27-year-old came on as a second-half substitute as the reigning champions drew 2-2 with Torino on Saturday, a result that further damaged their bid to win the league for a 10th straight season.
Juve boss Andrea Pirlo was without both Leonardo Bonucci and Merih Demiral for the Turin derby after the defenders tested positive for coronavirus during the international break.
Cristiano Ronaldo struck a late equaliser but the Bianconeri still dropped down to fourth in the table, 12 points behind leaders Inter with just 10 matches remaining.
Juve host fifth-placed Napoli in midweek too, a key fixture for both clubs in the battle to qualify for next season's Champions League.
Like compatriot Bonucci, Bernardeschi was involved for the Azzurri as they started their World Cup qualifying campaign last month – he made appearances in all three Group C fixtures in March, against Northern Ireland, Bulgaria and Lithuania.
The Italian Football Federation announced four members of their staff had returned positive tests prior to the game in Lithuania, which resulted in a 2-0 win for Roberto Mancini's side.