LAKE FOREST, Ill. -- Chicago Bears quarterback Mitchell Trubisky's inexperience still rears its ugly head on occasion, but veteran offensive guard Josh Sitton has seen enough to buy in.

"He's had the ability since he got here," Sitton said on Monday. "We all saw that. It just takes a long time to learn offenses in this league and it takes a long time to learn coverages. I mean, coverages change at the last second. It's tough. It's not easy to do as a young guy."

Trubisky is a mixed bag every week.

In last Sunday's 27-24 loss to Detroit, for example, Trubisky had several plays where he stood tall in the pocket in the face of pressure and managed to push the ball downfield for completions -- notably to rookie tight end Adam Shaheen.

Also, Trubisky's 19-yard scramble on fourth down on the game's final drive was a thing of beauty. The kind of athleticism and mobility Trubisky displayed on that play cannot be taught. That Trubisky's run came in crunch time was an added bonus.

"Well, he's a stud," Sitton said. "I've had confidence in him from the beginning, but like I said he's been growing and growing and you see it each week. Last week he probably took his first big leap in the passing game with the receivers and what not and then you saw that continue this week, and he's just growing and growing and you just see it.

"You saw the talent right away and he just keeps ... the nuances of the game he just keeps learning and learning. He gives you all the confidence in the world as a guy in the locker room and on the field, in the huddle. He has that look in his eye where you're thinking 'All right, he's going to get the job done.'"

On the downside, Trubisky is still off target sometimes because of bad footwork.

The second overall pick misfired on a pass to a wide open Benny Cunningham on the goal line last Sunday, and several other pass attempts sailed wide of their intended targets -- Trubisky also fumbled a snap that Detroit picked up and returned for a touchdown.

Trubisky is completing just 53.1 percent of his throws through six starts.

"He's got to continue to grow and learn the little nuances of this game," Sitton said. "The windows are a little bit tighter so you have to be a little bit quicker with your reads. You saw him this week, get one, two and into his third read really quick in a lot of situations. And getting the ball out on his third read, which you hadn't seen a ton in the past. So he's just growing and learning. It's really hard for a young quarterback.

But Sitton added: "He's a play-maker, he's got all the confidence in the world in himself and the guys around him, like I said, you can just see it on his face. I don't think he really says anything, he doesn't really need to say anything, you can kind of see it, by that look in his eyes. He's got what it takes to be a great player in this league."