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Mainz 05 was the club Voronin played for after Borussia Mönchengladbach. He joined Mainz 05 in 2007 after spending four seasons with Borussia Mönchengladbach. Voronin made a significant contribution to Mainz 05, helping them achieve promotion to the Bundesliga in his first season with the club. He remained with Mainz 05 for two seasons, making over 50 appearances and scoring 15 goals.