The are expected to hire Pettine, a former head coach of the, as Capers' replacement, a source told ESPN's Adam Schefter.
Bradley reportedly signed a new contract to remain defensive coordinator of the Los Angeles Chargers on Tuesday, and Fangio, whose contract expired on January 8, could be retained in Chicago by new head coach Matt Nagy.
Pettine was the Browns' head coach for two years before he was sacked after compiling a 10-22 record.
However, Pettine's defenses finished 20th in the league in points allowed in each of the next three years, and the 2015 Browns were 29th in points allowed and 27th in yards allowed.
Pettine worked as a defensive coordinator with the New York Jets from 2009 to 2012.
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His units were ranked in the top 10 in total defenses in the National Football League every one of those seasons, earning him a two-year stint as head coach of the Browns.
The Packers finished this season 7-9 and ranked 22nd in total defense.
Green Bay coach Mike McCarthy announced last week the team would interview Packers assistants Winston Moss, Darren Perry and Joe Whitt for the job.
It was reported earlier in the week that Philbin was interviewing with his former team and NFL Network's Ian Rapoport reported Wednesday that Philbin will be the new offensive coordinator. Also departing Green Bay are quarterbacks coach Alex Van Pelt and Luke Getsy, who left to become the offensive coordinator at Mississippi.