The Ospreys have been cleared of fielding an ineligible player in the group stages of the Heineken Cup.
European Rugby Cup Limited, the body that run the Heineken and Amlin Challenge Cup competitions, had been investigating the contract of scrum-half Ricky Januarie.
The former Springbok star joined the Ospreys on loan from Super 14 side The Stormers in November and played in four group matches as Scott Johnson's men beat Viadana in back-to-back ties before they lost to Clermont Auvergne and then toppled Leicester.
ERC regulations state that a player 'must have at least a three-month contract with the club' in order to be eligible for European competition.
Januarie, however, returned to South Africa in January, less than three months after arriving in Wales.
Premier Rugby, the umbrella body for Guinness Premiership clubs in England, reportedly issued a complaint and ERC ordered an investigation.
That investigation concluded on Monday in Dublin with the Ospreys told they had 'no case to answer'.
"Having co-operated fully with ERC at all times during their investigation into this matter, and providing them with all the relevant paperwork relating to Ricky's contract and registration, we are delighted to have been informed that they have found that Ospreys Rugby has no case to answer," said Ospreys managing director Roger Blyth.
"Now that we can finally put this matter behind us, we are, along with our many supporters, looking forward to our quarter-final against Biarritz in San Sebastian on Saturday 10th April."
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WRU Chief Executive Roger Lewis, Deputy Minister for Culture, Sport and Tourism Ken Skates and WRU Chairman Gareth Davies earlier this week launched a new competition in conjunction with the WRU unveiling its archive room.
Welsh players and management joined Deputy Minister for Sport Ken Skates at the Pierhead Building, Cardiff Bay earlier this week to reveal the Union's pioneering school-club hub initiative has been so successful the project will now almost double the scale of the original project.
The Scarlets, Newport Gwent Dragons, Cardiff Blues and the Ospreys look ahead to Judgement Day III which sees the Blues take on the Ospreys (2.30) and the Dragons tackle the Scarlets (4.45pm) at the Millennium Stadium tomorrow afternoon.
Ystradgynlais and Ynysddu played out a titanic struggle at Taffs Well in the SSE SWALEC Bowl semi-final. At the end of the game neither team could be separated after a 15-15 stalemate but Ystradgynlais go through on try count.
Blues strike first in JD III battle - Newport Gwent Dragons lock Andrew Coombs, WRU referee Dylan Llyr Jones and Cardiff Blues hooker Matthew Rees decide dressing room allocations for Judgement Day III
Wales Under 18 captain Calum Haggett has received a conditional offer to read Biomedical Science at St Anne's College, Oxford. WRU chairman Gareth Davies went to meet Calum and Coleg y Cymoedd Principal Judith Evans to wish him luck in his exams and pass on some of his personal experience.
Dodgy tattoos, carthorses, Avatar and soft chins are revealed by Wales Sevens players Tom Williams and Sam Cross as they profile the Wales Sevens squad taking part in Hong Kong this weekend in the latest round of the HSBC Sevens World Series.