Rams sophomore wide receiver Mike Thomas has been suspended for the first four games of the 2017 season for “violating the NFL policy on performance enhancing substances”, per a team announcement on Friday afternoon.

No details have been released regarding what the 22-year-old tested positive for, but any violation results in an automatic four-game suspension.

Related Draft Wire believes Mike Thomas could surprise in training camp

Thomas was selected 200th overall in the sixth-round out of Southern Mississippi in 2016 and played in 15 games for the Rams in his rookie season – seeing most of his action on special teams.

At the start of minicamp, coach Sean McVay told the media that he viewed Thomas as a downfield threat on his roster. Jared Goff was also really impressed with his speed.

“In talking about Mike, he’s kind of found a role for himself,” Goff said of Thomas. “He’s one of our faster receivers and can stretch the defense. I think he enjoys that role and understands that he’s going to be an over the top guy. It’s just a perfect role for him.

This kind of setback is huge for a player like Thomas, who was in the middle of really proving that he was worthy of a spot on the 53-man roster. While he can participate in training camp and in all preseason games and practices, he won’t be able to return to the active roster until Oct. 2.