Nunez, a 21-year-old midfielder and U.S. green-card holder, could debut Saturday when Chivas USA faces Toronto FC at BMO Field.
Nunez has lived in Dallas since moving from his native Honduras the age of 5 and is considered one of the most talented players to come out of Texas. He starred for the Dallas Texans and played one season at SMU before turning pro in 2003.
Nunez debuted for Dallas in 2004 and made his first start in 2005. He played 67 regular-season games and scored 14 goals for FC Dallas. He was outstanding toward the end of the 2005 season with five goals in his last 10 games and earned a starting job for the playoffs.
In 2007, new Dallas coach Steve Morrow cleaned house with the hope that Nunez would blossom as his central midfielder. But by the middle of the summer Nunez was on the bench as two other youngsters, Colombian Juan Toja and U.S. U-20 Dax McCarty, took over in midfield.
Last weekend FC Dallas took over the lead in the Western Conference with a 3-2 win over Columbus. Toja was out with a high ankle sprain, but Nunez didn't play.
Nunez played in the ODP system but never was eligible to represent the USA at the international level because he was not a citizen. He played for Honduras at the 2005 Under-20 World Cup and earned his first cap with the Catrachos in 2006.