The Chelsea midfielder was sent off for two bookable offences as the defending champions lost 1-0 to Spain in Sunday's (19.07.26) final in New Jersey but praised the efforts of the team despite their cynical tactics and the ugly scenes at the final whistle that saw midfielder Leandro Paredes shown a red card for violent conduct as he grabbed and pushed Spanish players Eric Garcia and Gavi.
Fernandez wrote on Instagram: "As time goes by, you realise there is something much bigger than just a result.
"For years, this group has represented us in the best possible way. It teaches that competing isn't just about winning; it's about giving your all for the jersey and never giving up.
"It has been a privilege to be part of a group that always stepped up, competed at the highest level, and defended these colours with pride, humility, and commitment."
Football's governing body FIFA has confirmed it will investigate Argentina's antics following the final whistle.
A statement read: "The FIFA Disciplinary Committee has appointed a Disciplinary and Ethics Prosecutor to investigate potential breaches of the FDC with regard to the post-match incidents. Further details will be communicated by the FIFA Disciplinary Committee once the prosecutor's report has been completed."
Meanwhile, Argentina goalkeeper Emiliano Martinez is considering whether "to step aside" from international football following La Albiceleste's World Cup final defeat.
The Aston Villa ace - who has won 67 caps for his country and helped Argentina to World Cup glory in 2022 - wrote on Instagram: "I dreamt we'd win it again, I dreamt of bringing it back to Argentina and making history once more.
"The truth is, the pain is hard to explain. There are many things to reflect on and how to move forward, and if it's time to step aside.
"I'm so sorry, I truly tried my best to help my country and my team-mates."