Wes Welker, wide receiver for the Denver Broncos, has tested positive for amphetamines, which were reportedly cut with MDMA, also known as Ecstasy or Molly, and been suspended for several games. The Broncos announced late Tuesday that Welker will be suspended for the first four games of the season for violating the NFL’s policy on performance-enhancing drugs, reports ESPN.

The 33-year-old five-time Pro Bowler was tested for drug use after attending the Kentucky Derby in May. He later argued that the sample had been tainted, according to sources. "I wouldn't have any idea where to get a Molly or what a Molly is," Welker told the New York Post. "That's a joke. I don't do marijuana, I don't do drugs. I don't do any drugs."

Welker was excused from practice to attend his appeal hearing in late August, sources tell ESPN Senior NFL Analyst Chris Mortensen. After his suspension, Welker said he was "as shocked as everyone at today's news,” in an email to the Denver Post.

"I want to make one thing abundantly clear: I would NEVER knowingly take a substance to gain a competitive advantage in any way. Anyone who has ever played a down with me, lifted a weight with me, even eaten a meal with me, knows that I focus purely on what I put in my body and on the hard work I put in year-round to perform at the highest levels year in and year out," he said.

Broncos coach John Fox said the suspension was disappointing, but expected. "While it's unfortunate to not have him to start the year, I have full confidence in our wide receivers and expect that group to continue playing at a high level," Fox said in a statement.

The 11th-year pro will miss games against Arizona, Indianapolis, Kansas City and Seattle. Welker will be eligible to return to the active roster Oct. 6.