Young was one of the biggest proponents of the Chicago Bears hiring Trestman to replace Lovie Smith. Trestman was the San Francisco 49ers' offensive coordinator for 1995 and '96 with Young at quarterback.
"I'm excited about it," Young said on "The Waddle & Silvy Show" on ESPN 1000. "I'm excited for Marc. And I stand by everything I said before. He's ready to do this.
"Nothing is guaranteed in the NFL, player or coach, but I'm hopeful that Jay Cutler decides that this is a great opportunity for him and will put the time in and the effort. I think he will. I think he has in the past but he'll really get the fruits of it if he does the boring things for the next three or four months. And he'll emerge as a much more disciplined quarterback. He's already good, and he'll be great. I hope that's the biggest change you'll see."
Young said Trestman's influence will surprise the Bears.
"If you run (the offense) right they'll be shocked how much easier it is," Young said. "How much more room there is to run."