Antonio Conte's first competitive game in charge of Inter ended in a smooth 4-0 defeat of Serie A newcomers Lecce - his hometown team.
Juventus' winning run has given Maurizio Sarri encouragement as he suggests they face their toughest title race in several seasons.
Inter have agreed a fee with Manchester United to take Ashley Young to San Siro after eight-and-a-half years at Old Trafford.
Barcelona captain Lionel Messi claimed a sixth Ballon d'Or in December, moving ahead of Juventus' Cristiano Ronaldo.
Goalkeepers Pepe Reina and Asmir Begovic have moved on loans, with the former joining Aston Villa and the latter switching to AC Milan.
Simon Kjaer has cut short his loan with Atalanta to join Milan, with a view to a permanent switch from parent club Sevilla.