Pettine is Packers' Head Coach Mike McCarthy's choice for defensive coordinator, according to the report.
Pettine went 10-22 in his two seasons as Browns head coach. Pettine worked under Ryan as his defensive coordinator with the from 2009 to 2012. His defenses with the Jets were first, third, fifth, and eighth, and his Bills defense was 10th in his lone season in Buffalo.
Pettine was sacked in Cleveland in 2015, but consistently his more talented defenses in Buffalo and NY were among the league's best.
Pettine replaces Dom Capers, who was sacked after spending nine seasons as Green Bay's defensive coordinator.
Pettine's scheme, like Ryan's, is rooted in a 3-4 system that relies heavily on press man cornerbacks and myriad blitzes. They had also had their eyes on Vic Fangio and Gus Bradley, but they didn't wait to interview them before deciding on Pettine for the job.
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The Packers dumped Capers on January 1 after they finished 22nd in the National Football League in total defense.
The Packers have not officially announced any additions, but with Pettine and Joe Philbin reportedly on-board, they appear to have their coordinators in place - and both are former head coaches.
Each finished in the top 10 between 2009 and 2013.
The Packers also considered hiring in-house and had interviewed their remaining defensive assistants: Joe Whitt, Darren Perry and Winston Moss.