Canelo Alvarez and Gennady Golovkin have signed up for drug testing after their trilogy fight was officially confirmed.
Alvarez suffered his second career defeat to Russian star Dmitry Bivol when stepping up to 175lb earlier this month. The Mexican star will now make a switch back to 168lb to defend his undisputed titles against Golovkin on September 17.
Both Golovkin and Alvarez have agreed to VADA drug testing for the bout in partnership with the WBC's 'Clean Boxing' programme. The pair's first meeting ended in a controversial split-decision draw leaving Golovkin aggrieved with the judges' scorecards.