Juventus coach Antonio Conte has insisted that it will not be easy for his side to retain the Serie A title in the 2013-14 season.

Conte has improved his squad with the likes of Carlos Tevez and Fernando Llorente, but the Italian believes that other teams have got stronger too.

"The values of clubs are changing and our rivals are all getting stronger. I think that it will be a very open Serie A campaign," Conte told La Gazzetta dello Sport.

"AC Milan and Inter have a lot of tradition, Napoli have spent a lot of money and have signed a great coach, while Fiorentina have legitimate hopes as well. They do not only have Mario Gomez, but also have Giuseppe Rossi up front.

"Lazio have improved their squad again and Roma have done some great business with the sale of Marquinhos for that figure."

Juventus open their campaign with a home game against Lazio.