BERLIN (AFP) - Hertha Berlin have added to their squad by signing 20-year-old Serbian international midfielder Gojko Kacar for three million euros (4.3 million US dollars).

After Brazilian striker Raffael joined Hertha on Monday from Swiss side FC Zurich, the Bundesliga's mid-table side have added defensive midfielder Kacar, who made his debut for Serbia last November, on a four-year contract.

Mid-table Hertha take on Eintracht Frankfurt on February 2 when the Bundesliga resumes after the winter break.