The Colts linebacker was suspended four games by the NFL Tuesday for violating the league’s policy on performance enhancing substances.
Jackson left Monday night’s 41-10 win over the New York Jets early because of a concussion.
A second-round pick of the Cleveland Browns in 2006, Jackson joined the Colts in 2014 and was selected to his first Pro Bowl after recording 138 tackles and four sacks.
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He had 150 tackles to lead the Colts last year and leads the team again this year with 78 tackles. He has not missed a game since 2010 when a shoulder injury cost him his season.
Jackson would be eligible to return for the playoffs if the Colts (6-6) should win the AFC South. They are currently tied with the Titans and Texans for the division lead.
