Matt Forte has revealed that the Chicago Bears have not shown their entire offense during their first two games of the season.

The NFC North side, who have made an unbeaten start to the 2013 campaign, brought in a new coaching staff during the off-season.

The running back told the team's website: "We haven't really showed a whole lot, and I don't expect us to two games into the season. This is a hefty playbook. We've got a lot of games left, so we have a lot of stuff saved for teams that play certain coverages or certain fronts.

"We have a lot of stuff I would say left over that we ran in camp. We know the stuff. We just put it back on the shelf so that when it's the opportune time to be call, it'll be called.

"[New head coach Marc Trestman is] a genius in this offense. We have a lot of different plays that isolate a lot of different people in this offense, but it depends on what the defense is running, when to call them. He's doing a great job of calling them in the right situations so that we can make a play."

Forte has 138 rushing yards and a touchdown so far this season.