USA head coach Gary Gold has hit out at uncapped loosehead prop Callum Black for pulling out of his squad for the June Tests.

Black, who will be joining Worcester Warriors from Ulster this summer, looked set to win his first international cap after being called up by Gold.

But Warriors’ ex-director of rugby confirmed the 32-year-old would not be joining up with his team and accused the front rower of letting the side down.

“It’s quite a contentious situation, but very disappointing,” Gold told Rugby Today.

“I’ve been in long talks with him and I’ve been monitoring him for so long.

“He’s unfortunately let us down now.

“He’s not really in a position to make himself available, so Callum won’t be joining us.”

American-born Black has previously represented Ireland at under 18, 19 and 21 level and played for Emerging Ireland in 2014.

He will be replaced by Saracens prop Titi Lamositele, 23, who has made 21 appearances for USA.

Gold, who left Warriors in late December to start his new job, is preparing the Eagles that will include Worcester hooker Joe Taufete’e for three Tests next month.

They face Russia in Denver on Saturday, June 9 before taking on Scotland in Houston on Saturday, June 16 and Canada in Halifax, Nova Scotia, on Saturday, June 23.

“I just think if USA Rugby and I believe we are serious about improving the game, at least putting ourselves on the world stage, one of the things I think we need is we need people who want to be part of the program,” Gold said.

“For me, the game is so driven on important ethical principles.

“It’s a cornerstone of the game, always has been.

“It’s one of the things that makes rugby different from other sports is that loyalty and camaraderie.

“We can’t go around begging players to play for the team.

“If they want to play international rugby and they want to represent their country, then that’s wonderful.

“There’s got to be a hunger and desire for that.

“We can’t be running after players.

“(Callum) made his call, and that’s fine. It’s just disappointing.”