 Aimar also appeared with Rosario in three Copa Libertadores editions, and ended his spell at the club in 1978 with a total of 334 matches and 32 goals.In 1979, he joined fellow league team San Lorenzo de Almagro, and eventually retired with the club in the end of the year, aged 28.Aimar's first managerial experience was at Deportivo Español in 1988.