According to Howard Balzer of the Sports Xchange, the NFL has disapproved St. Louis Rams center/guard Jason Brown’s five-year, $37.5 million contract. The report states that the Rams and Brown’s agents are making changes to the deal to comply with league regulations.
The problem involves a $2.3 million buyback clause in the final year.
It seems as though technically, there could be at least some window of opportunity / room for negotiation - if a team choses to pursue it. Obviously the Eagles would know the start bid if they're looking for an ear.