As a Swedish under-19 international, Diaz featured at the 2012 U-19 European Championship.
She scored the victorious Swedish team's extra time goal in the 1–0 final win over Spain.
Reporters covering the tournament for UEFA praised Diaz's technique and passing, naming her among ten "emerging talents".

In December 2012, national team coach Pia Sundhage called up Diaz to a senior squad training camp at Bosön.
Diaz was also capped for Sweden at under-23 level.

Diaz was called into the senior Sweden squad for the 2015 FIFA Women's World Cup qualifying match against Northern Ireland in April 2014, after injured Caroline Seger withdrew.
She appeared as an injury time substitute in Portadown, to win her first senior cap.
Diaz started her first match for the Blågult in June 2014, a 5–0 win over the Faroe Islands.

In May 2015, Diaz and Eskilstuna team-mates Olivia Schough and Sara Thunebro were named in Sundhage's Sweden squad for the 2015 FIFA Women's World Cup in Canada.
As a Swedish under-19 international, Diaz featured at the 2012 U-19 European Championship. She scored the victorious Swedish team's extra time goal in the 1–0 final win over Spain. Reporters covering the tournament for UEFA praised Diaz's technique and passing, naming her among ten "emerging talents".
In December 2012, national team coach Pia Sundhage called up Diaz to a senior squad training camp at Bosön. Diaz was also capped for Sweden at under-23 level.
Diaz was called into the senior Sweden squad for the 2015 FIFA Women's World Cup qualifying match against Northern Ireland in April 2014, after injured Caroline Seger withdrew. She appeared as an injury time substitute in Portadown, to win her first senior cap. Diaz started her first match for the Blågult in June 2014, a 5–0 win over the Faroe Islands.
In May 2015, Diaz and Eskilstuna team-mates Olivia Schough and Sara Thunebro were named in Sundhage's Sweden squad for the 2015 FIFA Women's World Cup in Canada.
Malin Diaz