The Manchester City hot shot, 29, who broke a rib in the smash, is said to have drifted apart from 31-year-old Karina Tejeda.
Karina, known as The Little Princess in their Argentinian homeland, and Aguero had been dating for four years.
The hitman is said to have gone along with team-mates from the national side ahead of an international match.
It comes after £50million Aguero was hurt in Amsterdam on Thursday when his taxi skidded and hit a lamp-post.
Karina only learned of the smash from an Argentinian TV reporter.
She appeared blasé when told, shrugging her shoulders as she said: “Really? I didn’t know. Oh well.”
Last week, she spoke about the couple’s break up while appearing on a cookery TV show in Argentina.
Asked about the separation, she replied: “From the start I didn’t say many things. And I feel really good for having done it that way.
“Today I don’t want to tell anything. I simply realise that people expect that I should sit down to maybe speak badly or drop a hint in one of my songs.”