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, Boss, 30, suffered a series of concussions in the 2011 season and was placed on the club's Disabled List on September 9.

"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."