Michael Oliver earned around £3,000 and business-class flights when he travelled to Saudi Arabia to referee a top-flight match between Cristiano Ronaldo's Al-Nassr and Al-Hilal this week.
The match fee is roughly double what he would get for a Premier League fixture and the move, unprecedented until now, is set to be repeated in the future with Oliver and other leading English officials.
Howard Webb, the new boss of the PGMOL, is said to be more relaxed than his predecessors at the Football Association - they handled such requests from foreign associations previously - and sees the benefit in his officials working in other domestic leagues, from both a reputational and experience perspective.