FILE - In this Sunday, Nov. 8, 2020 file photo, AC Milan manager Stefano Pioli calls out to his players during a Serie A soccer match between AC Milan and Hellas Verona, at the San Siro Stadium, in Milan, Italy. AC Milan coach Stefano Pioli has recovered from the coronavirus and will be back on the sidelines for Thursday’s Europa League match against Celtic. Milan said on Wednesday, Dec. 2, 2020 that the latest tests carried out on Pioli and his assistant Giacomo Murelli were negative for COVID-19. (AP Photo/Antonio Calanni, File)

FILE - In this Saturday, Oc.t 17, 2020 file photo, AC Milan manager Stefano Pioli, right, congratulates Zlatan Ibrahimovic at the end of the Serie A soccer match between Inter Milan and AC Milan at the San Siro Stadium, in Milan, Italy. AC Milan coach Stefano Pioli has recovered from the coronavirus and will be back on the sidelines for Thursday’s Europa League match against Celtic. Milan said on Wednesday that the latest tests carried out on Pioli and his assistant Giacomo Murelli were negative for COVID-19. (AP Photo/Antonio Calanni, File)