Peterson-Khan Vegas rematch in doubt

The highly-anticipated rematch between Lamont Peterson and Amir Khan next week could be in jeopardy after the American tested positive for a banned substance.

The unified junior welterweight titleholder, 28, reportedly tested positive for synthetic testosterone following a random test in March.

Peterson himself asked British boxer Khan to undergo random blood and urine testing in the lead-up to their HBO-screened fight May 19, ESPN reported.

The Las Vegas-based Voluntary Anti-Doping Association (VADA) was contracted to carry out the checks.

Jeff Fried, Peterson’s attorney, acknowledged the positive test Monday night.

"We have tremendous respect for VADA and its mission. Lamont, [trainer/manager] Barry [Hunter] and the entire team emphatically support random drug testing in the most comprehensive manner possible," Fried said. "We are working expeditiously with a team of pathologists and other medical specialists to confirm the origin of the test result and in full compliance with the rules of the Nevada Athletic Commission."

He added, "Lamont has never had a positive test either before or after this isolated occurrence, and we plan to submit the medical findings by close of business Tuesday reflecting the actual facts in support of Lamont’s good-faith intentions and the requirements of the commission."

In December, Peterson won a controversial split decision against Khan in his hometown of Washington, D.C.

Khan was docked points for pushing during the fight, and questions were raised about judge George Hill’s scoring.

There was also controversy over a ringside "mystery man," who later turned out to be IBF-affiliated Mustafa Ameen.