Travel and accommodation likely to cost £3,000 per game
Manx rugby clubs due to play in the UK may have to find an extra £3,000 for travel to each fixture.
The RFU has cut its travel budget, which previously helped Island sides pay for flights and accommodation.
Flight schedules could also prove a challenge when the sport resumes following the loss of Flybe earlier this year, and uncertainty over other operators.
Manx Radio's rugby correspondent Dave Christian says it's a big cost for local sides to make up:
Tynwald pays tribute to career of Sir Mark Cavendish
Julian Trummer parts ways with Jackson Racing
Cycling: Sam Brand extends stay with Team Novo Nordisk
Hockey: Two Island players called up to Scotland youth squads
David Johnson to return to TT with Lee Hardy Racing