Oakland Raiders coach Tom Cable said the team is negotiating a long-term deal with free-agent defensive lineman Richard Seymour. Cable said after the team's first minicamp practice Friday that the two sides are working on the deal, and that's why Seymour wasn't at the practice. The Raiders placed the exclusive franchise tag designation on Seymour in February. That prohibited him from negotiating with other teams and guaranteed him $12.398 million for the 2010 season.