[UPDATED with confirmation and details]

With two weeks until the season opener, D.C. United has acquired veteran defender James Riley from Chivas USA for a second-round pick in the 2015 MLS supplemental draft.

Riley, a 30-year-old right back, tweeted he was boarding a plane to Washington, and sources familiar with the talks said the deal is being finalized. United is not relinquishing a player. An official announcement is expected by tonight.

Riley, a 30-year-old right back, started 32 of 34 matches last season for the California-based club, which has been turning over its roster this offseason. Chivas will continue to be responsible for a “large chunk” of Riley’s $125,000 salary, one source familiar with the deal said.

“His experience will help solidify our backline,” United General Manager Dave Kasper said in a written statement.

It’s the second trade between United and Chivas this winter. D.C. acquired second-year forward Casey Townsend for a second-round selection in the 2014 regular draft.

Riley, from Wake Forest, played three seasons for New England, one for San Jose, three for Seattle and one for Chivas. He has made 210 regular season appearances with 192 starts. Aside from playing on the right, Riley has provided cover in the middle during his career.

Chris Korb, entering his third season, is United’s first-choice right back, with veteran Robbie Russell in reserve. Korb has also played on the left side.