I don't think its a lack of stamina or motivation. imo hes trying to do too much himself which admittedly works more often than not at Barca but international football is a different ball game alltogether pardon the pun.
Masch should be captain, sure hes not their best player but leadership skills are what a captain needs and Messi sadly lacks those. same for England with Harry Kane, hes our best player sure but hes not a leader. Messi shouldn't be wearing that armband, I dont care if Diego did, being your teams best player doesn't equate to captain material.
please fucking take him off penalties aswell, let Aguero take them.
his biggest issue for me, he can't get out of that 'everything must run through me' mentality hes been forced into at Barca. Dybala should be starting, i don't really give a shit about this 'they get in eachothers way' this is a world cup, 6 games to try and glue a team together, when you have players of that talent you make it work.