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Players from Super League side Celtic Crusaders are being investigated by the UK Border Agency over possible immigration offences.
BBC Wales Sport understands that visas used to bring some overseas players to Wales may be insufficient.
In a statement, the Crusaders have said they are co-operating fully with immigration officials.
And a UK Border Agency spokesman said: "While the investigation is under way it would be inappropriate to comment."
Before the start of the current season, eight of the 27 Crusaders players had difficulties obtaining the correct work permits.
Captain Jace van Dijk, leading try-scorer Tony Duggan and player of the year Damien Quinn were among the players whose arrival from Australia was delayed.
All overseas players at the club will have their visas inspected, but it is not known how many be under investigation for possible irregularities.
The club's statement added: "There were some issues with visas at the start of the season caused by confusion over the UK Border Agency's new regulations and immigration systems but as far as we are aware they were resolved."
The club said they were doing what they could to bring the investigation to a "swift and equitable conclusion".
The investigation is the latest blow for the troubled Bridgend-based club, who currently lie bottom of the Super League in their first season in the top flight.
Owner Leighton Samuel had to reassure fans earlier this week that he "would not walk away" amid fears the club are suffering financial difficulties.
That prompted Super League chiefs to reiterate their support for the club by saying are "determined to do what we can to help find additional investors".
Coach John Dixon admitted that it had been a turbulent week at the club.
"Footie clubs - and life in general - rarely run smoothly... there are always challenges to face," he told BBC Sport Wales.
"I think that there will be a positive outcome [to the club's financial position] in the end.
"Financial problems are affecting all of our economy, and to think that a small rugby league club would be impervious... wouldn't make sense.
"To get the long-term assurances that we've had was a really positive step."
http://news.bbc.co.uk/sport1/hi/rugby_l ... 142408.stm