Wanderlei Silva and Chael Sonnen , each dealing with issues related to drug testing, recently retired from mixed martial arts competition. If Silva is to be believed, however, there is the possibility that the two could in Brazil. Sonnen retired after a random drug test came back positive. A second drug test, which was administered before he retired, also came back positive, leading to Sonnen having to give up his FOX broadcasting job, as well.
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Wanderlei Silva Reportedly Agrees to Fight if Chael Sonnen Accepts – MMA Weekly