Lucas, 27, joined the Bears on a one-year deal this offseason. He was expected to play a reserve role in Chicago's secondary. His decision became official Monday, nearly a week after the Bears opened Halas Hall to the team's veteran players for training camp.
In June, Lucas expressed his concerns about playing amid the coronavirus pandemic this season.
"It’s a real thing," Lucas said. "It’s still killing. It’s still affecting a lot of people. I’ve been taking it serious as far as the quarantine going, my family has. And, really I’m just less worried about me, more worried about my son and my wife. We’re just trying to stay as safe as possible."
In other roster moves, the Bears activated defensive lineman John Jenkins and tight end Eric Saubert from the reserve/COVID-19 list. The team doesn't have any players currently occupying that reserve list. The Bears also released offensive lineman Dino Boyd on Monday.