The Portuguese has enjoyed a remarkable start to life in Turin, but has any other player ever made such an instantaneous impact on Italian football?
GettyCristiano Ronaldo
Cristiano Ronaldo has made a fine start to his Serie A career, netting 12 goals in his first 18 outings since joining Juventus from Real Madrid during the summer.
The Portuguese's importance to Massimiliano Allegri's squad was underlined on Wednesday when he was left out of the starting line-up for the first time this season.
Juve found themselves a man and 2-1 down away at Atalanta but Ronaldo came off the bench to preserve his new club's unbeaten record with a late leveller.
With that in mind, Goal looks back through the history books to see if any former overseas superstar has ever made such an instantaneous impact on Serie A.
AdvertisementGettyGabriel Batistuta
After successful spells with both River Plate and Boca Juniors, Gabriel Batistuta secured a move to Fiorentina in 1991 after firing Argentina to Copa America glory with six goals.
The striker initially found goals hard to come by at the Artemio Franchi, netting only three times by the end of December, but he ended his first season in Serie A with a creditable 13, as a weak Viola side finished 12th.
'Batigol', as he came to be known, struck 16 times during his second campaign but that was not enough to save Fiorentina from the drop.
However, even though Batistuta had established himself as one of the top strikers in Serie A, he resisted offers from elsewhere to help the club secure an immediate return to the top flight, thus earning himself iconic status in Florence.
Batistuta continued to score freely for Fiorentina but despite some near misses, it was only after leaving to join Roma in 2000 that he won a long overdue Scudetto.
GettyRuud Gullit
AC Milan broke the transfer fee world record in 1987 by signing Ruud Gullit from PSV for approximately £6 million but the Dutchman initially took time to settle at San Siro, struggling with the Italian language and only scoring two goals during the first half of the season.
However, the forward improved from January onwards, and ended up with nine goals to his name as the Rossoneri claimed their first Scudetto since 1979.
Despite some injury issues, Gullit would go on to become a legend at Milan, whom he helped win back to back European Cups, even scoring twice in the 1989 final against Steaua Bucharest.
GettyKaka
Despite widespread interest in Kaka's services, AC Milan managed to snap up the Sao Paulo star in 2003 for just €8.5m, which president Silvio Berlusconi rather prophetically described as "peanuts"!
The attacking midfielder was the revelation of the Serie A season. Kaka had only scored twice by the winter break but he was proving a wonderful creative force, replacing Rui Costa in the starting line-up, and the goals began to follow in the New Year.
Indeed, he ended his debut campaign with 10 in total and was named Serie A Player of the Year for playing such a pivotal role in Milan's title triumph.
Essentially, Kaka was well on his way to becoming one of the finest players ever to grace Italy's top flight.