Long is still hoping he can get a work permit so he can sign for West Ham before the transfer window closes on Thursday.
West Ham want to sign Long, but he cannot get a work permit at the moment.
The player has played in six of USA's past seven games. If he had not been injured for one game, he would qualify for a work permit.
“As our biggest ally, it seems strange that a football player from the US can't automatically get a work visa to play in England," Long said.
“Every kid in the USA dreams of playing in the English Premier League. Not many players get the chance, so of course I would like to play there someday.
"I just signed a new contract, so the decision is up to my club and the other team. NY Red Bulls gave me an amazing opportunity, so it would also be a dream to play for RB Leipzig or RB Salzburg, but that won't happen because they only sign players 24 or under."
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