While playing for the club, he started to build his reputation as one of the best, scoring a whopping 115 goals in 167 appearances.
In 1981, he moved to Boca Juniors and signed a contract in a £3million transfer.
After playing with the club for a year, Diego transferred clubs again.
He moved to Barcelona in Spain for the £5million, which was a world record fee at the time.
During his career, he played for Argentina in four World Cups.