United's Wolff undergoes successful surgery

Wolff, 35, had the surgery Monday and “the timeframe of his return is unknown
at this point,” according to the club. He has played nine games, including one
start, this season.

The ex-U.S. international was on the 2002 and 2006 World Cup teams, and played
52 times for his country. He has played in MLS since 1998, and was named an
assistant under United head coach Ben Olsen this season.