"We opted for Andriy because he knows the Bundesliga, he speaks German and he can play in a variety of different tactical systems.
"Andriy proved with Leverkusen and Liverpool that he can perform when under pressure. I am happy that we have found an experienced striker for our young team."
The impact of Fernando Torres restricted his first-team opportunities and Robbie Keane's arrival this summer forced him further down the pecking order.
He moves back to the Bundesliga, where he previously played for Bayer Leverkusen, Cologne, Mainz and Borussia Monchengladbach.
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