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However, manager Lionel Scaloni has confirmed the midfielder's absence was not injury related.Mac Allister missed the final two matches of the 2024/25 title-winning campaign because of an undisclosed injury and only returned to playing again deep into Liverpool's pre-season schedule.
However, he sat out Argentina's 3-0 win over Venezuela overnight on the bench.
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Before the fixture took place, La Albiceleste boss Scaloni had stated during his press conference: "Alexis Mac Allister arrived late, and I don’t think he’ll make the team because he barely trained."
It would appear that this was caused by an issue with a KLM flight that forced the Liverpool star to divert to Paris, France, before continuing on the journey back to his homeland.
As a result he could only watch on from the sidelines in Buenos Aires as his national teammates cantered to victory.
He still has opportunity to play in the upcoming away match against Ecuador on September 10.
But Slot will want Mac Allister fit when he returns to Merseyside, Liverpool have an action-packed two weeks with Premier League fixtures against Burnley and Everton squeezed between the start of UEFA Champions League and Carabao Cup campaigns.
The reigning world champions had already confirmed their place at next summer's World Cup, which is to be held between Canada, the United States, and Mexico.
However, the fixture held some significance as it has been billed as potentially Lionel Messi's final appearance for his country on home soil.
The modern day legend scored twice against the Venezuelans.
"There are so many emotions, I've experienced so many things on this field.
"It's always a joy to play in Argentina with our people.
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