The New England Revolution midfielder will be out for the next four months after having a procedure Monday to correct 'chronic instability' in his shoulder.
Nguyen, 25, had five goals and two assists in his first season in MLS and was the only Revolution player to appear in every one of the club's 30 matches this season. He will be out of action for approximately the next four months, a timetable that puts his return at the start of the 2013 MLS preseason.
Nguyen, a former star at Indiana University with three U.S. national team caps in 2007 to his name, tried his hand overseas in the Netherlands, Denmark and Vietnam before signing with MLS last December. He was assigned to the Vancouver Whitecaps in a weighted lottery before the club cut him on March 1. The Revolution selected him in the Waiver Draft the following day, and he went on to make 27 starts for Jay Heaps' side.