Why did Mauricio Pochettino sub Christian Pulisic off at half? USMNT star only plays 45 minutes vs, Paraguay

Christian Pulisic was substituted off at halftime during the United States Men's National Team's opening World Cup match against Paraguay, with manager Mauricio Pochettino making the decision to replace him after just 45 minutes of play. The exact reason for the early substitution, whether tactical or injury-related, was the subject of scrutiny following the high-profile move. Pulisic, a key player for the USMNT, did not complete the full match in what was an important opening fixture at the tournament.