Scharner admits he has unfinished business at Hamburg.
"There has been no real change. I am due to be back at Hamburger SV this summer," he told the Hamburger Morgenpost.
"It's my utmost ambition to make a name for myself at Hamburger SV. Those experiences I am having in the Premiership are giving me an extra boost to do so.
"I am actually believing in my full strength again. I am a good player, if I am getting regular match action!"