The 33-year-old scored 42 goals in 84 appearances for his country between his debut in 2001 and April 2011, when he retired from the international game.
As well as Basel, Frei has appeared for Thun, Lucerne and Servette Geneva.
He also spent three seasons with Germany's Borussia Dortmund and a stint with French side Rennes.
Since returning to his home city of Basel in 2009, Frei has landed three straight Swiss league titles.
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