Ben Blair will play no part in the remaining Heineken Cup Pool matches after he suffered a broken hand in a Magners League defeat to the Ospreys on New Years Day.
Cardiff Blues have confirmed Blair has a very small fracture in a bone in his right hand, which has been put in a cast to protect it.
Blair will see a hand specialist on Monday and it is thought that the injury could keep him out of action for up to four weeks.
The New Zealand international fractured the 4th metacarpal bone in the match against the Ospreys on New Year's Eve and his hand is now healing in a splint.
This means the the goal kicking Kiwi will miss the crucial match with Gloucester at the end of the month.
The Blues may have a 100 per cent record in Pool 6, but with Gloucester also performing well, the Kingsholm tussle is likely to be a Pool decider, and the Blues know only too well the cost of coming second in the group stage.
Failure to progress in first place last season meant a trip to Toulouse in the quarter-finals of Europe toughest club competition. The result went the way of the three-times champions and now, Blues boss Dai Young must wait on medical results to see if his goal-kicking full back can help his side into the final eight.
Blair walked off midway through the first half with an ice bag on his hand during his side's 16-12 defeat to their regional neighbours.
Meanwhile, Martyn Williams, the Wales and Lions flanker, was another to leave the field clutching his shoulder, but he is expected to be fit.
"Martyn has struggled throughout the Autumn Test series with a shoulder injury," said Young.
"We rested him for two weeks and he just took another bang on it. There is nothing which needs an operation and nothing to be worried about there."
On the day the Wales U20 squad for the Six Nations is revealed, WRU Head of Rugby Performance Geraint John discusses the priorities of the Wales U20 programme, and moves being undertaken to make it easier for Welsh Exiles to be part of the WRU pathway - and to help keep Welsh qualified players in Wales
It was a double celebration for Wales and Ospreys scrum-half Rhys Webb when he called at the home of Welsh rugby to help commemorate the first anniversary of Principality Stadium and his return to fitness this weekend ahead of the RBS 6 Nations.
Prior to their departure to Wellington for the next leg of the World Series, Wales trained with England and Ireland. WRU TV caught up with Owen Jenkins who revealed the 'buzzword' which is driving the Wales squad on.
Wales head coach Rob Howley explains his decision to change the captaincy of the national side with Ospreys second row Alun Wyn Jones taking over from Sam Warburton for the forthcoming RBS 6 Nations. Howley is hoping his decision will allow Warburton to rediscover his 'mojo'.
How do you follow a dancing hippopotamus - the Ospreys wheelchair rugby team has just the 'oneness' to do it say the BBC! For a decade the sight of a herd of hippos synchronised swimming around their own private blue lagoon, has lit up our television screens at regular intervals between favourite BBC One shows. But now the nation's most watched channel has relinquished its famous amphibious mammals in favour of a new show-reel which includes the Ospreys wheelchair rugby team.
Head coach Rowland Phillips and key front rower Carys Phillips look ahead to games against Spain and Ireland as Wales Women ramp up their preparations for the forthcoming Six Nations. The two warm-up games are a 'massive opportunity to refine the squad' according to the Welsh camp.
Martyn Phillips has discussed details of the newly published 'Strategy for Welsh Rugby' which puts in black and white terms the plans and direction of the governing body of the national sport in Wales for the next decade.
WRU chief executive Martyn Phillips has urged Welsh rugby fans to follow in the footsteps of their soccer counterparts at last summer's Euro Championship by backing their team to the hilt in the upcoming RBS 6 Nations campaign.
Chief executive Martyn Phillips has highlighted the plans for Wales to become a breeding ground for national and elite club rugby coaches, which are contained in the WRU's 10-year 'Strategy for Welsh Rugby'.
Andrew Coombs is enjoying his new role as Nelson forwards coach. The former Dragons and Wales lock has big ambitions to become a professional coach but feels it's important to learn the ropes in grassroots rugby and where better than his home club Nelson, with friends and family close to hand.
Students at Brynllywarch Hall School, near Newtown, have transformed their own lives, and are now having a positive impact on others through rugby. The sport has had a life-changing effect on the well-being of the students who are now delivering rugby sessions to local primary schools and playing for a new mixed ability side
Wales reached their first semi-final since 2013 in the opening round of this season's HSBC World Rugby Sevens Series in Dubai. WRU TV's Graeme Gillespie recaps on what proved to be an eventful tournament
Wales and Ospreys back row James King, who came through the North Wales age grade system, nominated North Wales Regional Community Rugby Manager Marc Roberts, in the WRU's 'Diolch' initiative where squad players thanked those who played a part in their rise to the top.
Beating Merthyr has boosted Carmarthen Quins hopes of reaching a top eight spot in the Principality Premiership. Quins captain Haydn Pugh is delighted with his team's progress and is determined that everyone from the Under 6s through to the senior team, enjoys the ride.