| The 22 year old joined Beziers in 1998 but the southern French club were relegated from the French top flight last season.
Nyanga made his international debut for France against the United States in 2004 and has been a regular with the French squad ever since.
Nyanga is the third recruit made by the three time Heineken Cup champions this summer, joining Grégory Menkarska from Auch and fellow flanker Aidan McCullen from Leinster.
Toulouse will set out to defend their title against Llanelli Scarlets on Round 1 of Pool 6 on weekend of 21/22/23 October.
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