Jennings was Seattle's first-round draft choice in 2006. He started 14 games last season, and was re-signed less than a month ago, the Seahawks giving him a six-figure signing bonus to re-sign a contract scheduled to pay him about $1.8 million.

The trade of Jennings reflects the fact Seattle is so pleased with the performance of Brandon Browner and the development of rookies Richard Sherman and Byron Maxwell that the Seahawks didn't foresee a role for Jennings in the secondary this season.

Jennings, 28, started 44 games in his five seasons as a Seahawk. He did not play in Saturday's exhibition game at Denver because a tight hamstring, according to coach Pete Carroll.

McDonald was not invited to the NFL Scouting combine in 2009, but had an impressive workout during his pro day, including a 38-inch vertical leap and 36 bench-press repetitions at 225 pounds.

Clinton McDonald | Player profile
NFL.com

Also, NFL teams are making their first round of roster cuts this week, and must be reduced to 80 players on Tuesday. The Seahawks' cuts have begun, according to Curtis Crabtree of 950 KJR-AM, who reports WR Patrick Williams has been informed he will be released.