U.S. legend backing ... Mexico?

MOSCOW — Arguably the greatest player in U.S. history is in hot water following a bizarre exchange involving an endorsement deal with a bank.

“The tournament is here! USA fans, our team may not be in Russia, but our neighbours to the south are. So join me and their proud #sponsor @WellsFargo to cheer on our other team, Mexico @miseleccionmxEN. ¡Vamos México!” Landon Donovan tweeted before Sunday’s momentous match between Germany and Mexico.

Of course, the U.S. and Mexico are fierce soccer rivals who have competed in epic World Cup qualifiers through the years.

Questioned by former U.S. teammate Carlos Bocanegra, Donovan shot back with an overthe-top reply that drew even more attention to his change in allegiance.

“You grew up in (Southern California) and owe much of your soccer skill to playing with Mexicans,” Donovan told Bocanegra. “Your father is of Mexican descent. Look around our country, are you happy with how we are treating Mexicans?

“Open your mind, stand for something & remember where you came from.”

Former U.S. International Herculez Gomez eventually came to Bocanegra’s defence.

“This is an incredibly terrible take,” he responded. “Questioning ones loyalties to culture and/or heritage because HE questioned YOU for taking marketing dollars to “root” for your SPORTING RIVAL?

“You can hate El Tri — this doesn’t mean you have anything against Mexicans.”

Even U.S. soccer can’t get along.