Tapp, who signed a one-year tender with the Seahawks on Monday, said he had no idea a trade was in the works. He later told KJR AM in Seattle that he had agreed to a contract extension with the Eagles, and numerous reports out of Philadelphia said it was a three-year deal.
"There's a lot of turnover in the NFL each year," Tapp told the Seattle Times. "I'm happy to have another opportunity to play. I'm sad to be leaving Seattle. This is the team that gave me a chance for the past four years. The fans were awesome. It's a business. It's a part of the business."
Originally a second-round draft pick by the Seahawks in 2006, Tapp has 18 sacks, two interceptions, eight forced fumbles and four fumble recoveries in 65 career games. He had four sacks in a 2007 game against the St. Louis Rams.
"Darryl is a very intense football player and we're happy to acquire him," Eagles coach Andy Reid said. "He plays very hard every snap. He's smart, he's a good person and he'll fit very well into our defensive scheme."
The Eagles were interested in Tapp when he played at Virginia Tech, according to general manager Howie Roseman.
"Darryl is an up-and-coming player in this league, in my opinion," Roseman said. "He's a good player and a good person. ... We believe he'll be a good addition to our defensive line."
The Associated Press contributed to this report.