The 21-year-old has been told that Rothosen will not be making his move permanent by general manager Frank Arnesen.
Bruma believes that he has benefited from his time at the Imtech Arena.
"Frank Arnesen told me that the club will not be buying me, and I will not be staying on at HSV," the centre-back told Hamburger Morgenpost.
"Now I am looking forward to a return to London and to Chelsea.
"I feel those two years on loan have still been good for me as a player, despite playing less than expected recently."
Chelsea signed Bruma from Feyenoord's youth academy in 2007.