"Piojo is the way he is and there's no way he is going to change. I am happy they are talking a lot about him," said Mexico's captain Rafael Marquez.
Herrera has more followers on Twitter than other coaches -- 735,000 -- and often posts selfies to his official account, http://twitter.com/MiguelHerreraDT . A favorite is a June 15 snap with a legion of Mexico fans in the background.
"You generally don't hear a lot about the coaches," said Jesus Berumen, 59, a Mexican fan in Los Angeles. "He spreads happiness. He's so natural in the way he does things."
Herrera's overly enthusiastic side hasn't always gotten him positive attention.