A transition player designation gives the team the right of first-refusal to match within seven days of an offer sheet being given to the player by another team after his contract expires (which is March 3). If the team matches the offer sheet, they retain the player. If they choose not to, they will not receive compensation.
According to a source familiar with the situation, the Eagles are looking at designing a contract which will make it hard for Seattle to match. The Eagles have one of the best capologists in Joe Banner who put together a contract for then free agent DE Jevon Kearse a few years ago that made it very difficult for the Tennessee Titans to match.
The Eagles, according to the source, could put together the so-called "poison pill contract." This kind of contract is usually front loaded which makes it hard for the originating team to match. It should be noted that Seattle has around $20 million in cap space which is believed to be more than Philadelphia has at this point.
Also, according to a source with knowledge of the situation, it's "highly unlikely" the Eagles will re-sign starting right tackle Jon Runyan. The plan, as of now, would be to move starting right guard Shawn Andrews or second-year offensive lineman Todd Herremans in to his spot.