Anderson Silva through the years

UFC middleweight Anderson Silva over the years.

Anderson Silva speaks during a press conference for UFC 162 at X-Gym on June 12, 2013 in Rio de Janeiro, Brazil. (Photo by Buda Mendes/Getty Images)

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Brazilian MMA-UFC fighter Anderson Silva (R) practices with a sparring in Lapa, Rio de Janeiro, Brazil on October 10, 2012. Silva will fight against US Stephan Bonnar on 13th october. AFP PHOTO / Christophe SimonCHRISTOPHE SIMON/AFP/GettyImages

Anderson Silva's gruesome leg injury at UFC 168 left MMA fans in attendance in shock. (Getty)

Anderson Silva

Anderson Silva

LAS VEGAS, NV - JULY 06: (R-L) Chris Weidman punches Anderson Silva in their UFC middleweight championship fight during the UFC 162 event inside the MGM Grand Garden Arena on July 6, 2013 in Las Vegas, Nevada. (Photo by Donald Miralle/Zuffa LLC/Zuffa LLC via Getty Images)

anderson silva

Anderson Silva works during the open training session Wednesday. (Getty Images)

Anderson Silva

UFC 162: Press Conference

RIO DE JANEIRO, BRAZIL - JUNE 12: Anderson Silva (right) with your manager Marcus Buaiz speaks during a press conference for UFC 162 at X-Gym on June 12, 2013 in Rio de Janeiro, Brazil. (Photo by Buda Mendes/Getty Images)

UFC 148: Silva v Sonnen II

LAS VEGAS, NV - JULY 7: (L-R) LeBron James and Anderson Silva in attendance during UFC 148 inside MGM Grand Garden Arena on July 7, 2012 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC via Getty Images)

UFC 148 Weigh In

LAS VEGAS, NV - JULY 6: (L-R) Opponents Anderson Silva and Chael Sonnen face off during the UFC 148 Weigh In at the Mandalay Bay Events Center on July 6, 2012 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)

The 2012 ESPY Awards - Arrivals

LOS ANGELES, CA - JULY 11: (L-R) UFC fighters Anderson Silva and Jon Jones arrive at the 2012 ESPY Awards at Nokia Theatre L.A. Live on July 11, 2012 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)

Fighters Only World Mixed Martial Arts Awards 2011

LAS VEGAS, NV - NOVEMBER 30: Mixed martial artist Anderson Silva holds the Knockout of the Year award for his victory over Vitor Belfort at UFC 126 at the Fighters Only World Mixed Martial Arts Awards 2011 at The Pearl concert theater at the Palms Casino Resort November 30, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)