Stafford spoke in vague terms about his new deal after details were reported by the Detroit Free Press and Crain's Detroit Business.
"Just trying to be able to have enough cap space to be able to get the players we need and the players we want," Stafford told the Free Press. "I think there's guys in this locker room that, given the opportunity, a lot of them would do the same. We have a great locker room, a great bunch of guys that want to win, and if I can restructure a deal to help our team bring guys in here that can help us win, then I'm all for it."
Both players converted reduced base salaries into signing bonuses to be paid over the remaining years of their deals.
Stafford, the No. 1 overall pick in the 2009 NFL Draft, signed a six-year contract worth up to $78 million with $41.7 million in guarantees. Vanden Bosch signed a $26 million, four-year deal last year.
The Free Press, citing papers filed with the NFL Players Association, reported that Stafford reduced his 2011 base salary from $9 million to $525,000, the minimum for players with two credited seasons, while Vanden Bosch cut his base salary from $4.5 million to $810,000, the minimum for players with seven to nine years of experience.
The Associated Press contributed to this report.