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'Sad' sparring partner explains how he injured UFC champion Jose Aldo

Jose Aldo’s next title defense against Conor McGregor is in jeopardy after the UFC featherweight got injured in a sparring session at Nova Uniao, and his teammate is devastated.

Alcides Nunes, a 5-0 lightweight from Nova Uniao, was training with the UFC star in Rio de Janeiro when he ended up breaking Aldo’s ribs with a spinning back kick. Aldo vs. McGregor, scheduled to headline UFC 189 in Las Vegas, Nevada, on July 11, is now in danger.

"I threw a kick but slipped with all the sweat on the mat, and ended up hitting his rib," Nunes told MMAFighting.