Cristiano Ronaldo's arrival will not make Juventus certain to win the Serie A title, Napoli midfielder Allan has warned.
The 33-year-old made his debut for Juve in Saturday's 3-2 win over Chievo, having joined from Real Madrid in a €112 million (£100m/$129m) deal in July.
Ronaldo failed to score in that match, but his appearance caused a spike in television ratings, with a reported 2.3 million viewers making Juve's victory the fourth-highest total for a Serie A match on Sky Sport Italia.
Allan, whose Napoli side won 2-1 at Lazio, is happy to see a player of Ronaldo's pedigree in Italy's top flight and thinks it will be a boost to the competition.