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Bayer Leverkusen was Voronin's next club after 1. FC Köln. He joined the Bundesliga side in 2007 after spending three seasons with Köln. Voronin made a significant impact at Leverkusen, scoring 20 goals in 73 league appearances. He helped the club win the DFB-Pokal in 2009 and reach the UEFA Champions League quarter-finals in 2008.