PHOENIX -- While a proposal has yet to be formalized, the Washington Redskins will make a trade offer to the Chicago Bears aimed at acquiring two-time Pro Bowl weakside linebacker Lance Briggs, agent Drew Rosenhaus and two league sources told ESPN.com late Monday night.

Briggs

Washington will propose a swap of first-round draft picks in this year's draft -- the Redskins own the sixth overall selection and Chicago has the 31st choice in the lottery -- in exchange for Briggs. The potential deal, which is expected to pick up steam on Tuesday morning as the annual NFL meetings continue here, would be contingent on the Redskins signing Briggs to a long-term contract.

Having failed last spring to consummate a long-term contract with Briggs -- reportedly a seven-year, $33 million deal on which both sides worked for several weeks before the negotiations collapsed-- the Bears employed the franchise tag last month to keep the four-year veteran off the open market.

PHOENIX -- In a deal that addresses Philadelphia's offseason priority for adding a playmaking linebacker, the Eagles acquired veteran Takeo Spikes from the Buffalo Bills on Monday night.

Spikes

The Eagles also acquired veteran backup quarterback Kelly Holcomb as part of the trade package. In exchange, Buffalo received seven-year veteran defensive tackle Darwin Walker, who had become extraneous in Philadelphia because of the team's depth, and an undisclosed draft choice, believed to be a late-round pick.