Lionel Messi participates in a training session with Argentina ahead of the team’s FIFA World Cup opener against Algeria, scheduled for Monday. Multiple reports describe the session as intense as Argentina prepares for its first match of the tournament. The coverage focuses on Messi’s involvement in team training and his readiness for the upcoming fixture, with no additional details provided in the sources about specific drills, fitness concerns, or lineup changes. The reports also do not mention any injuries, substitutions, or confirmed changes to tactics. Overall, the information indicates that Argentina’s captain is actively training with the squad in the lead-up to the Algeria match, as the team finalizes its preparations for its World Cup debut.