Gary Kubiak was expected to announce his starting quarterback Tuesday morning for Denver’s preseason opener. The Broncos coach instead dragged out the drama another 24 hours.

The biggest question at Broncos training camp — who is the No. 1 quarterback — is still unanswered. Kubiak and his staff are deliberating whether veteran Mark Sanchez or Trevor Siemian will start at Chicago on Thursday night, with a decision expected Wednesday.

‘‘I'm holding y'all off for one more day,’’ Kubiak said.

Sanchez and Siemian are listed as co-No. 1s on the depth chart as neither has shown himself as the clear-cut starter for the Super Bowl champions. Kubiak said he would meet with his staff to decide who would take the first offensive snap Thursday. He said the game plan is to play Sanchez and Siemian a quarter each, and to have rookie Paxton Lynch play the second half against the Bears.

‘‘What we want to do is put a number on reps and what we want to see from each one of them so that from an evaluation standpoint we’re looking at things pretty equally,’’ Kubiak said. ‘‘That’s the most important thing right now.’’

Sanchez, in his eighth year, said the competition is healthy.

‘‘I'm not worried about it,’’ Sanchez said. ‘‘It’s whenever Kubiak is ready to decide. It’s his call all the way and we just have to keep competing for the whole season. It doesn’t really matter what happens here.’’

The Broncos traded for Sanchez after Peyton Manning retired in March and Brock Osweiler signed with Houston two days later. Siemian, Denver’s third quarterback for most of 2015, impressed in offseason workouts to make training camp a quarterback competition.

Siemian served as the backup for six games last year when Manning was hurt. He played in one game without throwing a pass. He is more familiar with the offense this year and says his comfort level has grown.

‘‘I was pretty nervous last year. I wasn’t getting a ton of reps,’’ he said. ‘‘I was trying to get a grasp of the playbooks. In that sense, I think I'm a little more comfortable, as in I know my assignments. I know where my eyes need to go. There’s a sense of, ‘I know what I'm doing.'’’

Kubiak did say linebacker Von Miller, cornerback Aqib Talib, and offensive tackle Russell Okung would not play. Defensive end DeMarcus Ware is on the non-football injury/illness list.

Talib returned to practice Monday and increased his workload Tuesday, but he is not ready to play Thursday.

Giants’ Cruz dinged up

Victor Cruz may have to wait a little longer to play for the Giants.

The wide receiver, who missed all of last season with a calf injury and has been limited to six regular-season games in the last two years, is looking iffy for the Giants’ preseason opener against the Dolphins after sustaining a groin injury in practice Tuesday.

Coach Ben McAdoo was taking a wait-and-see approach when asked whether the seventh-year receiver who was once one of the NFL’s biggest playmakers would play Friday night at MetLife Stadium.

Cruz also was uncertain, saying it usually takes a couple of days to get the tightness out. However, he was certain this was not a case of “here we go again’’ with the injuries.

‘‘I think I know the difference of something that is really bothering me and will take a long time and something that is just normal football training camp soreness, things that just come about as training camp goes on,’’ Cruz said. ‘‘I'm not having those doubts or those feelings in my mind right now.’’

His intention for now is to listen to his body and act on that.

‘‘I went through one of my biggest workloads the last week and came back the next day and practiced and everything felt good,’’ Cruz said. ‘‘No pain, no ailments or anything like that, so my body has been good and responding well to the wear and tear of camp, so I'm excited about that. I just want to keep putting things forward.’’

Colts lose Langford

The Colts will be without starting defensive end Kendall Langford for three to four weeks after he had arthroscopic surgery on his knee. Coach Chuck Pagano, who did not say which knee was injured, said Langford hurt his knee in practice last week, was sent back to Indianapolis for an MRI and doctors found a congenital defect . . . The Jaguars are down another offensive lineman after Josh Wells broke his right thumb Monday during training camp. Wells will have surgery Thursday . . . The Jets activated defensive end Muhammad Wilkerson from the physically unable to perform list after he missed the start of training camp while rehabilitating from a broken leg. He broke his right leg in the season finale against Buffalo last December . . . Cornerback Chris Culliver signed with the Dolphins, who hope he can return from knee surgery and help their thin secondary. Culliver tore ACL and MCL ligaments in his right knee during practice last Thanksgiving with the Redskins, and they released him in May.

He had signed a $32 million, four-year deal with the Redskins in March 2015 after four years with the 49ers. Culliver has 26 career starts and seven interceptions.