The only professional league so far to feature regular long-haul travel is Super Rugby, which features teams from Australia, New Zealand and South Africa.
ECONOMIST: Travel and athletic performance: Road warriors | The
Despite its recent shift to include more intra-country contests, Super Rugby is considering adding new teams in the United States, Argentina or Japan.
ECONOMIST: Travel and athletic performance: Road warriors | The
The small travel-related advantages seen in isolated situations may then grow to resemble the larger, consistent imbalances like those seen in Super Rugby.
ECONOMIST: Travel and athletic performance: Road warriors | The
Salvi, who captained Australia's Under-21 side in 2006 and has represented the Brumbies in Super rugby since 2005, has an option to extend his initial deal for a further year.
Fiji-born Tuqiri, who was also strongly linked with a move to Welsh side Ospreys, switched to rugby union in 2002 and played his Super 14 rugby in New South Wales with the Waratahs.
Delve's decision to move to Melbourne will cast doubt over his Welsh international career as the Super 15 rugby season goes head-to-head with the Six Nations.
Soliola, part of the New Zealand team at this month's Four Nations tournament, admits that he is relishing the physical side of playing Super League rugby.
Super 14 Rugby in the Southern Hemisphere has been trialling the ELVs for the last year and now the Guinness Premiership is set to adopt some of these laws in domestic competition.
He also agrees with the coach's belief that the brand of rugby in Super League is more exciting and expansive than the National Rugby League (NRL).
Outside-half Carter, 26, plays his rugby with Super 14 side Crusaders but is said to want to play in Europe.
The victory means that Australian sides have won the World Club Challenge, which pits the Super League and National Rugby League champions against each other, for the last three years.
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In conditions harking back to the pre-Super League era of winter rugby, both sides made plenty of mistakes but Warrington - who dropped to sixth place in the table - were severely punished.
"The Challenge Cup should be given greater priority by the RFL, but what St Helens did was disrespectful to Bradford, to the fans, to the Super League competition and to Rugby League in general, " Schofield said.
His first game in rugby league is likely to be a Super League fixture against Catalans Dragons on 19 March.
The 23-year-old winger joined Wasps from Super League champions Leeds Rhinos after the end of the rugby league season.
Auckland led 26-6 in the final quarter before last year's semi-finalists - for whom rugby league star Lote Tuqiri was making his Super 12 debut - scored two late tries.
The Lions comes together every four years and are seen as something of a super team featuring the best of Britain and Ireland's rugby talent.
The lease on the ground is owned by the Rugby Football League (RFL) who bought the stadium from Super League team Bradford Bulls in 2012.
The Glamorgan players like to indulge in a spot of rugby, and the Queenslander - whose brother plays in the Super 12s - already knows his place.
The Rugby Football League are set to announce which clubs have been granted Super League licences for the next three years on 26 July.
BBC: Wakefield consider ground share with rivals Castleford.
The Rugby Football League introduced new regulations regarding quota players which limited my opportunities in Super League.
De Villiers says his players are playing by the same rules applied in the Super 14 competition, but are being treated unfairly by referees, and the South African Rugby Union has asked its legal representative to get an explanation for what they consider refereeing inconsistency.
The Rugby Football League (RFL) had made plans to put back the start of the Super League campaign by six weeks to accommodate the World Cup in February and March.
BBC: SPORT | Rugby League | World Cup moved to end of season
He is currently assistant at Super 14 team the Chiefs and is also in charge of the Waikato NPC side, and Waikato Rugby Union chief executive Graham Bowen said he departs with their blessing.
After a difficult first season - on and off the pitch - in the Super League last season, the club relocated to Wrexham in December and are hoping to connect with rugby league fans across north Wales.
Millward said the prospect of the Super League's top two teams going head to head on Saturday was one which should excite all rugby league fans.
St Helens was the first of rugby league's famous names to visit Bridgend in the Crusaders first season of their three-year Super League franchise.
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