NFL has suspended Mike Jefferson, Dallas Cowboys’ practice squad receiver, for four games for violating the league’s policy on anabolic steroids and related substances. The 25-year-old will serve the suspension without pay.

In 2007, Jefferson was signed by the Cowboys as an undrafted free agent. On August, 2008, he was cut by the Cowboys when the team reduced its roster to 53 players. However, he was signed back to the team’s practice squad the next day.