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Bayer Leverkusen was Voronin's previous club before he joined Liverpool. He spent four seasons with the German club, making over 150 appearances and scoring 42 goals. During his time at Leverkusen, Voronin helped the team win the DFB-Pokal in 2004 and reach the final of the UEFA Champions League in 2002. He was known for his versatility, playing as a striker, winger, or attacking midfielder.