Colts' Jackson suspended four games for doping

D'Qwell Jackson #52 of the Indianapolis Colts celebrates after a sack during the game against the Tennessee Titans at Lucas Oil Stadium on November 20, 2016 in Indianapolis, Indiana (AFP Photo/ANDY LYONS) (Getty/AFP/File)

Los Angeles (AFP) - Indianapolis Colts linebacker D'Qwell Jackson has been suspended by the NFL for four games for violating the league's policy on performance-enhancing substances.

The NFL made the announcement Tuesday, and the suspension begins immediately for Jackson, who will be eligible to return to the active roster on January 2 -- if the Colts qualify for the playoffs.

The 6-6 Colts are locked in a three-way tie with the Houston Texans and Tennessee Titans atop the AFC South division.

In 12 games this season Jackson has posted a team-best 78 tackles, one sack and three pass deflections.

The 33-year-old is in his third year with the Colts after playing his first eight NFL seasons with the Cleveland Browns.