Midfielder Thien Nguyen, who appeared in 23 games with the San Diego Sockers last season, will return for the 1990-91 Major Soccer League season, the club announced Thursday.

Nguyen, the 12th player to sign with the Sockers for the upcoming season, had one goal and four assists during his stint with the club last year. He originally signed with San Diego in October 1989 as a developmental player from the University of California, San Diego, said club spokesman Tim Latta.Locally . . .