The Fiji winger crossed the line after a surge down the left, with a video replay required to confirm the score.
Defending champions Toulouse had been trailing by five points following Rory Kockott’s penalty.
The South African scrum-half scored all of Castres’ points, which included a 53rd-minute try.
Matanavou’s score was the hosts’ only try, with Lionel Beauxis kicking five penalties and Luke McAlister adding a sixth just before the hour mark.



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