Hamburg have signed Italy Under-19 midfielder Jacopo Sala from Chelsea for an undisclosed fee.
Sala, 19, who came to England at the age of 15 from Atalanta Bergamo's youth system, signed a three-year contract.
"Jacopo is a player for the future," said Hamburg's new and Chelsea's former sporting director Frank Arnesen.
Sala is the second player the German side have signed from the Blues this week following the capture of defender Michael Mancienne.
Arnesen, who took over at Hamburg after leaving Chelsea at the end of the season, added: "Jacopo has played through all the Italian youth teams and possesses outstanding physical and technical abilities."
Sala played for Chelsea's reserves and helped the club win the 2010 FA Youth Cup.
"It is a big chance for me to be able to play at Hamburg. I would like to continue my development as quickly as possible and to appear for Hamburg in the Bundesliga," added the Italian.
Dane Arnesen also stated he will hold talks with another Chelsea defender, Jeffrey Bruma, with a view to bringing him to the Bundesliga, reportedly on a two-year loan deal.
"He is on duty with Holland," Arnesen said.
"Afterwards, we will meet and talk about it. We will look each other straight in the eye. We will decide what is best for Jeffrey Bruma and Hamburg."