Answer
1. FC Köln was the club that Voronin joined after his time at Mainz 05. He made the move in 2000 and spent three seasons with the Billy Goats, making over 100 appearances and scoring 25 goals. Voronin's performances in Cologne earned him a move to Bayer Leverkusen in 2003, where he would go on to establish himself as one of the most dangerous strikers in the Bundesliga.