"I was thrilled to hear about Benfica's interest. It is a huge deal playing for such a big club," the midfielder told reporters in Lisbon.
"Benfica is one of the biggest clubs in the world with supporters everywhere."
The 19-year-old, a European under-19 champion with Germany last year, joined Hertha's youth teams in 2002.
Despite making his debut with the senior side as a 17-year-old, he has failed to feature in the league this season.
(Reporting by Karolos Grohmann; Editing by John O'Brien)
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