Manager: Contaminated supplement led to Yoel Romero's failed drug test

Esther Lin, MMA FightingYoel Romero admits he failed a USADA drug test, but never consciously took a banned substance.

The UFC middleweight contender and his manager Malki Kawa were on Monday's edition of The MMA Hour with Ariel Helwani. Kawa and Romero explained that Romero took a supplement after his fight with Ronaldo Souza in December and that supplement turned out to be contaminated.

"The substance has a label with a bunch of stuff on it," Kawa said. "None of that is illegal to take. What he got popped for is not on the label. So it's obviously not his fault that he popped for this."

Kawa said his team and USADA both sent out the supplement for testing and it came back that it contained a…