Defensive coordinator Rod Marinelli and offensive coordinator Mike Tice won't be back with the Chicago Bears next season, the team announced.
New coach Marc Trestman said during his introductory news conference Thursday that Marinelli has decided to move on.
"I had a chance to talk to Rod, and we had a good discussion," Trestman said. "He's made up his mind, I believe, to move on. I know to move on.
"And we'll begin the process of identifying those people that can be put in a position. But that's a process I'll begin to talk to (general manager Phil Emery) about once we move on today."
Tice said the Bears let him go, but declined to comment.
The Bears have already hired Aaron Kromer as offensive coordinator/offensive line coach and Joe DeCamillis as special teams coordinator.
"You know we had Joe D., right? You know we got Aaron. So you can recognize from that we feel a sense of urgency to get that started," Trestman said. "One of the things I want to do because I've been in their shoes, I want to get down the hall here and get a chance to meet and talk to the coaches and let them know I empathize with their positions.
"They're sitting in their chairs waiting to know what we're gonna do, and I want to make sure I talk to (general manager) Phil (Emery), and make sure we give these guys the respect and the dignity that they deserve. We'll begin that process as we move along."
Trestman said he likely will bring several coaches from his Montreal staff with him to Chicago.
"I've got final say on the staff," Trestman said. "Certainly with anything that Phil and I do, it's gonna be a collective process. I want his input. I don't have all the answers. He can give me perspective that I don't have. So yes I will have final say, and Phil has said that to me on a number of occasions. As we talk ideas, a reminder, you decide who your coaches are.
"Yes, there will be some guys coming down. I've talked to them about it. But we haven't locked it up because they may have other opportunities or decide to move in a different direction. But I would expect we'd have a few guys from the staff come south."
To replace Spencer, the Bears have hired former Dallas Cowboys running backs coach Skip Peete, according to Calvin Watkins of ESPNDallas.com.
Marinelli spent four seasons with the Bears, including the past three as defensive coordinator. He was previously the defensive line/assistant head coach.
The Bears' defense ranked fifth in total defense this season, 17th last season and No. 9 in 2010. The Bears led the NFL with 24 interceptions, including eight for touchdowns, this season.
Marinelli was the Lions' head coach from 2006-08. He went 10-38, including an 0-16 record in 2008.