The Carolina Panthers made waves when they traded D.J. Moore and the first overall pick to the Chicago Bears earlier this offseason.

During negotiations, the Panthers refused to include pass rusher Brian Burns and defensive tackle Derrick Brown in the deal.

Panthers general manager Scott Fitterer said it was just too difficult to replace Burns and Brown. Contracts also figured into the deal as the pair are still on their rookie contracts.

"There were certain players that we never really wanted to trade," Fitterer said. "It's so hard to replace a Derrick Brown or Brian Burns, a pass rusher (and) an interior, dominant young player on a (first) contract. D.J., we didn't want to move either. But it's a little bit easier to replace a receiver than it is a pass rusher or a three-tech."