Bears outside linebacker Robert Quinn did not practice Friday for the third straight day due to an ankle injury and was listed as doubtful for Sunday's season opener in Detroit.
A 10-year NFL veteran, Quinn signed with the Bears in free agency after leading the Cowboys with 11.5 sacks last season while starting all 14 games he played.
"He's at a point where we know, No. 1, what he did last year," coach Matt Nagy said Friday. "That's why he's here. That's all we see right now in regards to him. That's what we know."
Early in training camp, Nagy told reporters that Quinn was being eased into practice after dealing with an undisclosed personal issue. The ankle injury is not related to the personal issue, but it's created frustration for Quinn.
"I think frustration is probably a good word," Nagy said. "I know how Robert is as a person. When you know who he is, he's pretty laid back, but he's old school, too. He's really old school in his mentality of how he approaches things. It's where we're at. We'll see. He's doubtful, but things can change, so you don't know where things are at, but we'll see."
According to NFL guidelines implemented in 2016, being listed as "doubtful" on an injury report means the player is "unlikely to play." Players who are "questionable" are "uncertain to play."
The Bears listed seven players as questionable for Sunday's game, including outside linebacker Khalil Mack, who was limited in practice Friday with a knee injury.
The other six questionable players all practiced without restrictions: Running back David Montgomery (groin), receivers Cordarrelle Patterson (knee) and Javon Wims (Achilles), right guard Germain Ifedi (triceps), tackle Jason Spriggs (knee) and nickel back Buster Skrine (finger).
After Montgomery rushed for 889 yards and six touchdowns during a promising rookie year in 2019, the former Iowa State standout appears to be primed to have a breakout season.
"No one has higher expectations than David," Nagy said. "He has a lot of great expectations about what he wants to do. What's been neat about him, and I told you this in the past, is he realized last year, he learned a lot from. And because his expectations are so high, what he wants to do, sometimes it doesn't happen overnight. But he's had so much growth in this offseason. And now it's just a matter of producing on the football field and both of us having trust in each other. Because we obviously think he's a very good football player; he's a very good football player that can do a lot of things to help us win."
The Lions, meanwhile, likely will be without star receiver Kenny Golladay, who did not practice Friday for the second straight day due to a hamstring injury and is listed as doubtful.
The Chicago native, who attended St. Rita High School and Northern Illinois University, led Detroit and set career highs in all receiving categories last season with 65 receptions for 1,190 yards and 11 touchdowns.
Also for the Lions, tight end Hunter Bryant (hamstring), safety C.J. Moore (hamstring) and tackle Halapoulivaati Vaitai (foot) have been ruled out of Sunday's opener.
Receiver Danny Amendola (hamstring), defensive end Da'Shawn Hand (groin), linebacker Julian Okwara (knee), and cornerbacks Jeff Okudah (hamstring) and Darryl Roberts (groin) are questionable after being limited in practice Friday. Okudah was selected by the Lions with the third overall pick in this year's draft out of Ohio State.