Nicknamed "El Tolo," Gallego's career ended with a total of 440 Argentine league appearances and 35 goals in a span of 14 years.

After his experience with the national team, El Tolo returned to coach River Plate, with whom he won another championship, this time in 2000.

In 2004, he returned to the Newell's Old Boys organization after a 23-year hiatus, and once again proved his worth as a head coach, winning a championship that very same year.

After leaving Newell's Old Boys, Gallego was sought after by a myriad of clubs, including San Lorenzo de Almagro, but chose CD Toluca in Mexico.

His time off did not last long, as a juicy offer from Tigres UANL made him change his mind and take over for Mario Carrillo as coach.