During the 2001/02 season, he was on loan at FC St. Gallen where he played 28 games, but returning to the Grasshopper-Club, he played just one game in the 2002/03 season.
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Zanni started off playing football for SC Buochs and then was scouted by Grasshopper-Club Zürich subsequently starting his professional career with Grasshopper-Club in 1998 at the age of 18.
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He joined FC Thun in 2003 and there he broke into the first team immediately.
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After six and a half years in Basel, during the winter break 2010/11, and transferred free of charge to FC Vaduz in the Swiss Challenge League.
Reto Zanni who played for the Switzerland national under-21 football team and now plays for FC Basel and Christophe Lambert who currently plays for FC Luzern.