The Summer transfer window has just ended, but the Italian top clubs -like Juventus- keep on working to reinforce their teams; the bianconeri -as well as AS Roma, Arsenal and Chelsea- have not succeeded in signing Paris Saint-Germain 19-year-old midfielder Adrien Rabiot, who is still having some problems with the Ligue 1 defending champions; the bianconeri already have an agreement with the player, and, as reported by La Stampa, would like to sign him at the end of the season, when he will become a free agent, while, on the contrary, their competitors are ready to swoop on the young Frenchman in January. The Serie A defending champions are tracking also some more experienced players, like -according to fichajes.net- Barcelona 31-year-old wingback Dani Alves, who also has just one year left on his contract with his current club. On the contrary, for the next transfer window, the Piedmont's club -as reported by the Daily Star- is thinking about Manchester United 26-year-old attacking midfielder Juan Mata, who could leave the Red Devils because of the recent arrivals of Angel Di Maria and Radamel Falcao. Meanwhile, as revealed by sporx.com, in the last hours of the recent transfer window, Juve have refused an offer made by Galatasaray for 27-year-old Uruguayan defender Martin Caceres. Last season on loan atMontpellier, 19-year-old forward Mbaye Niang seemed intended to leave again AC Milan during the last transfer window, but the young Frenchman has finally remained at "San Siro"; as revealed by La Gazzetta dello Sport, the player -in front of his mother- has promised to the Lombard club's Chief Executive Adriano Galliani that he will start to act as a professional, and that his model won't be any longer his compatriot Philippe Mexes.