Promising as his preseason debut may have been, one game won’t be enough for Mitchell Trubisky to challenge for the lead job.

Chicago Bears head coach John Fox explained as much following Thursday’s loss to the Denver Broncos, indicating Mike Glennon remains the unquestioned starter at quarterback.

“Our depth chart is not going to change after one game,” Fox said, according to Jeff Dickerson of ESPN. “That’s a really good defense our first unit went against, probably one of the top three defenses in the league. You have to look at a lot of different things. I can understand how you guys might think (we could make a change), but we’re not going to change a whole lot after one game.”

After signing a three-year, $45-million contract in free agency, Glennon will presumably be given every opportunity to sit atop the depth chart for the better part of the upcoming season.

But the early returns on both new quarterbacks at least make the conversation a little more interesting as the exhibition slate moves forward.

Glennon threw a pick-6 to Chris Harris Jr. on the first drive of Thursday night’s game, and he’d go on to finish his brief appearance with completions on just 2-of-8 attempts for 20 yards.

Trubisky, who Chicago traded up one spot to select at No. 2 overall in April, fared far better during the extended work that followed Mark Sanchez‘s departure in the second quarter.

The former North Carolina standout completed 18-of-25 passes for 166 yards and one touchdown, adding 38 rushing yards on three attempts.

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