The new head coach has been working with the quarterback since replacing Lovie Smith at the start of the year.
Trestman told the Bears's official website: "We've always got a number of plays we can throw out and we won't feel any difference in the size of the game plan. So he's certainly instrumental. Quarterbacks always have that in the final trimming of the game plan as we move through the week.
"He spends Monday and Tuesday looking at tape just like we have. One of the first things I'll do as I begin to put the game plan together is to talk to him about what he sees, his strengths and weaknesses.
"Toward the end of the week we pare the game plan down to things he really likes. We talk every day about the things he really liked that we did, and if there's something we need to throw out, we've got plenty of plays."
The Bears play the Cincinnati Bengals later today.