Erik Morales has reportedly failed a drugs test ahead of his light welterweight world title rematch against Danny Garcia in New York.
It is as yet unclear what substance the 36-year-old Mexican is thought to have taken.
However, both camps are waiting on the results of Morales's B sample after an initial A sample was revealed to be positive, according to Fighthype.com.
Morales and Garcia are scheduled to fight at the Barclays Center in Brooklyn, New York on Saturday.
