The Wigan full-back has risked incurring the wrath of the Australians and New Zealanders plying their trade in Super League by accusing them of blocking the career path of young English players.
"They will want to prove they're the players that make the competition, the overseas players that come over and sign massive contracts and take money off young English lads who are trying to make a living," Tomkins said. "We want to prove why we English players are the best in the league."
Tomkins' comments come amid continued speculation linking him with a move to the NRL, with South Sydney backer Russell Crowe raising the possibility of him joining the Burgess brothers at the Rabbitohs rather than his anticipated destination of the New Zealand Warriors.
Crowe casually dropped in an invitation for talks during an interview Tomkins carried out for Sky Sports at the premiere of the new Superman film "Man of Steel" in Leicester Square.
Tomkins, the reigning Super League Man of Steel, took time out from England preparations to attend the event but, as the audience sat down to watch the blockbuster, he was whisked away to rejoin his team-mates as they moved camp from Loughborough to Manchester.
Having missed Wigan's last match with an Achilles injury, Tomkins was determined to play for his country in a game he believes is crucial in the build-up to the end-of-season World Cup.
"It's a massive opportunity any time you get to pull on the England jersey," said Tomkins, who is England's record scorer with 15 tries from 16 caps. "The Exiles concept is one I fully back. It's an important part of our preparation for the World Cup at the end of the year so I certainly didn't want to miss out on this.
"I want to perform and personally play the best I can. As a team, there is a pressure on us to perform and I'm sure we will.
"The squad is really strong, there is a buzz around the camp and everyone is looking forward to it."
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