"Brandon is a teammate and he's optimistic that his teammate will be back," Trestman told reporters.
"He's not the doctor. When I talk about a player's prognosis to play, it's not mine. It's what the doctors have said is the normal.
"That doesn't mean that Jay can't beat the odds and come back quicker and again, he's optimistic, you've talked to him, he's optimistic, and we all are, I don't make that determination, the doctors do."
The Bears are 4-3 in their season after week eight.