The South Americans open their defence of the trophy with a home game in the early hours of Friday morning (UK time), in advance of the 2026 tournament in Canada, Mexico and the United States.
There are six automatic places at the showpiece event up for grabs in the continent's section and Scaloni remains in charge after guiding the nation to their triumph in Qatar.
Martinez was one of United's outstanding performers at Arsenal before being forced off in the 67th minute, when experiencing discomfort in his foot, as Harry Maguire took his place.
Reds manager Erik ten Hag said he was not sure if it was an injury, following the match, and the centre-back linked up with his country as planned.