"I've retired. It's official now," the 34-year-old, who started his career with his home team Dynamo Barnaul in 1992, was quoted as saying by Russian media.
Siberian-born Smertin joined Chelsea from Girondins Bordeaux in August 2003, helping the west London club to the Premier League title in 2005. He also played for fellow Premier League sides Portsmouth, Charlton Athletic and Fulham.
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