I don’t know what Pettine’s contract situation is but wouldn’t be surprised either way if they keep or move on from him. Going into his second year LaFleur will know whether this is the guy he wants as DC.
For the heck of it, these were the main candidates McCarthy looked at before adding Pettine two seasons ago:
Darren Perry – was hired by the Packers to be the safeties coach in 2009 and was let go after the 2017 season. He had reportedly been a candidate to join Mike Vrabel's staff in Tennessee but Perry hasn’t returned to the NFL at this point. He had a job lined up with Birmingham in the Alliance of American Football which… didn’t work out so well.
Joe Whitt Jr. – had been with the Packers staff since 2008 and in 2018 was promoted to defensive passing game coordinator. He was let go along with much of the staff after the end of the 2018 season. The Browns hired him as secondary coach and defensive passing game coordinator five days later. But life with the Browns has a way of going screwy. No worries though, Whitt was hired by the Falcons as secondary coach earlier this month.
Winston Moss – joined the Packers way back in 2006 and by 2018 had risen to assistant head coach/linebackers coach. Moss was fired two days after McCarthy in December 2018, following tweets he made which were critical of Packers management. Moss is now head coach and general manager of an XFL team, the Los Angeles Wildcats.
The less likely external candidates, I don’t think these got as far as a formal interview for DC:
Vic Fangio – stuck around in Chicago as DC in 2018 then was hired as head coach in Denver in 2019 where he went 7-9 (losing to both the Packers and Bears).
Gus Bradley - McCarthy asked for permission to speak with the Chargers’ defensive coordinator. I think the request was denied. Either way, the Chargers gave Bradley a three-year contract extension in January 2018 and he remains DC there.
Patrick Graham - McCarthy spoke with Graham about an open position on GB’s staff but I'm not certain it was for DC. At that time Graham was the defensive line coach for the Giants. The Giants have a new head coach for 2020 in Joe Judge, who has promoted Graham to DC/assistant head coach.