The Eagles announced that linebacker Jake Knott has been suspended without pay for the first four games of the 2014 season for violating the NFL policy on performance enhancing substances.
Knott, who is entering his second season, is eligible to participate in all offseason and preseason practices and games.
"We're very disappointed to learn of his suspension," Eagles said in a statement. "We have spoken to Jake and he is fully aware of the mistake he made and owned it. The key for him, however, is to learn from that mistake and move forward with his preparation for the 2014 season."
The 23-year-old Knott played in 12 games as a rookie, mostly on special teams. He was credited by the team with five special teams tackles and six on defense.
Knott released the following statement through the Eagles:
"Several weeks ago, I was shocked to learn that I tested positive for a stimulant that is banned by the NFL. I have never knowingly ingested a banned substance, but like most players, I take nutritional supplements.
"Unfortunately, I now know that supplements are not regulated and thus may contain things that are not listed on the label. The NFL policy is very strict, so I have chosen to take immediate responsibility. I look forward to participating in team workouts, training camp and the pre-season with my team.