The last two seasons, Kozlov played in Yaroslavich. 31-year-old Russian volleyball player began his career in Belgorod Lokomotiv-Belogorie in 2000. Since 2008, Kozlov began performing in Ural and in 2010 moved to Yaroslavich.
During this time, Kozlov has won the Champions League twice (2003, 2004), twice the Cup of Russia (2003, 2005) and three times the championship of Russia (2003, 2004, 2005).