RENTON, WASH. - Terry Boss, a five-year MLS veteran and the backup goalkeeper for Sounders FC for the past three seasons, has announced his retirement, Seattle Sounders FC announced today.

"We are going to miss Terry," said Sounders FC head coach Sigi Schmid. "He was a valuable member of the Sounders and it is unfortunate his career has come to a close. We wish him well and good health in his future."

"It has been a great honor and privilege to play for Sounders FC," said Boss. "This has obviously been difficult, but the support I have received from my family, friends, teammates, coaches, front office and fans has been tremendous. From the top down this team has always felt like a family, and needless to say I will never forget the time I spent in Seattle."

Boss, 30, suffered a series of concussions in the 2011 season and was placed on the club's Disabled List on September 9. In his four starts during the 2011 season, Boss helped Seattle advance to the semifinals of the Lamar Hunt U.S Open Cup and earned victories in the first two matches of the CONCACAF Champions League Group Stage, including a historic shutout win in Mexico over reigning champions CF Monterrey.

"I don't know what the future holds, but I do know that I will proudly join the greatest fans in the world by supporting and wishing nothing but the best for the entire Sounders FC family," said Boss.

Boss, an Oregon native, joined Sounders FC on June 26, 2009 after playing for the New York Red Bulls from 2008-09. In his three seasons with Seattle, Boss started eight of nine appearances across all competitions and posted three shutouts. His only MLS appearance was 45 minutes against FC Dallas on April 22, 2010.

Prior to joining Sounders FC, Boss was named USL-2 Goalkeeper of the Year in 2008 while with Charlotte. He also earned eight caps with the Puerto Rico National Team.

Transaction: Seattle Sounders FC (MLS) - GK Terry Boss retired