Haloti Ngata has been suspended for the rest of the regular season for violating the league's policy on performance-enhancing substances, the team announced Thursday.

Ngata, a five-time Pro Bowl defender, received a four-game suspension from the NFL, and he's eligible to return for the playoffs if the Ravens make the postseason.

"I made a mistake, and I own this," Ngata said in a statement. "I took Adderall and take full responsibility for doing this. I am deeply sorry and broken up over this. I let down my family, my teammates, Ravens fans and myself. My hope is that the Ravens make the playoffs, and I believe they can do this. And, then I can come back and help us win."

The Baltimore Ravens will turn to second round pick Timmy Jernigan to replace Ngata at defensive tackle.