Former Illinois defensive lineman and eight-year NFL veteran Corey Liuget is going after an ex-trainer for damages caused by “extreme, irresponsible, unauthorized and harmful conduct,” according to a report.

The Sports Biz has reported Liuget has filed a lawsuit against former trainer Ian Danney and Performance Enhancement Professionals, Inc. The lawsuit claims that Danney injected Liuget with a prohibited substance without his consent or knowledge.

Liuget was suspended by the NFL in March for violation of the NFL’s performing enhancing substances policy. He tested positive for a banned substance.

After learning of the suspension, Liuget accepted the penalty.

“I made a mistake and take full responsibility,” he said in March. “As part of my training program, I placed my trust in someone who, in hindsight, was not well-versed in the NFL’s policy on banned substances.”

Liuget appears to have a case against Danney, at least as it relates to the four-game suspension, which will cost him approximately $2.24 million. However, Liuget is also arguing that the Chargers used his suspension as leverage to negotiate his contract. For that, he is pursuing $15 million.

In total, the lawsuit includes 16 claims for relief.

Liuget was selected with the 18th overall pick by the Chargers in the 2011 NFL Draft. In eight seasons in the NFL, he’s amassed 26o tackles, 22.5 sacks and forced six fumbles.

At Illinois, Liuget was a second-team All-B1G selection in 2011.