Former UFC lightweight champion Sean Sherk will be required to undergo additional drug testing prior to his showdown with reigning 155-pound kingpin, BJ Penn, at UFC 84: "Ill Will" at the MGM Grand Garden Arena in Las Vegas on May 24, according to MMAPredictions.com.

The Nevada State Athletic Commission (NSAC) today voted in favor of the extra measure because the "Muscle Shark" tested positive for a banned anabolic agent (Nandrolone) in the wake of his successful title defense against Hermes Franca at UFC 73: "Stacked" in July 2007.

He was subsequently stripped of his crown, suspended and fined by the California State Athletic Commission (CSAC) -- a ruling that he bitterly denies and blames on a mix of dietary supplements, shoddy lab work, breaches in the "chain of custody" and other factors.

It was enough to get his suspension reduced from 12 months to six; however, Sherk's reputation has taken a big hit in the court of public opinion throughout the ordeal.

Sherk was apparently present for the NSAC proceedings via telephone and agreed to submit the extra sample during the week of April 21 -- one full month prior to his fight with Penn.

For more details of the proceeding head over to MMAPredictions.com to read the entire entry. To check out the latest UFC 84 card click here.