Wales prop Adam Jones has explained his move to the Cardiff Blues in an open letter to Ospreys fans.
Cardiff Blues have launched a fundraising and awareness campaign in support of injured player Owen Williams.
Cardiff Blues and Wales winger Alex Cuthbert says his preferred option is to stay with the Cardiff Blues.
Adam Jones says his move to Cardiff Blues is about "a new challenge".
– Adam Jones
At this stage in my career I want a new environment and to really push myself.
I've been really impressed by the set-up at Blues and the desire to achieve in the coming years under the leadership of Mark Hammett. It is that ambition and potential for the future that excites me about this move.
Obviously I would like to thank everyone at the Ospreys - from the players and coaches to the wonderful supporters - who have been absolutely fantastic with me. I wish the region every success for the future.
Cardiff Blues have announced the signing of veteran Wales prop Adam Jones from rival region the Ospreys.
Jones, 33, has made 95 appearances for Wales and toured twice with the British & Irish Lions.
Wales captain Sam Warburton has been left in limbo in terms of his club rugby as the dispute between the WRU and regions continues.
Warburton signed a central contract with the WRU over the summer. But as the regions have a policy of not fielding centrally contracted players, he can't be selected for the Cardiff Blues until a new participation agreement has been struck between the regions and the WRU.
The Blues play Exeter in their penultimate pre-season friendly on Friday. Warburton has recovered from the shoulder injury that put him out of action last season, but the Blue have confirmed that they can't pick him.
– Paul John, Cardiff Blues attack coach
Until the services agreement has been sorted we unfortunately can't pick Sam and so he won't be involved against Exeter.
I've been told by the region that, at the moment, he is unable to play for us. Until everything is signed and sealed that will be the case. As soon as it is done we will crack on.
The ongoing dispute leaves Warburton in danger of missing the start of the PRO 12 competitive.
The Blues travel to Leicester on 29th August for their final friendly before their Guiness PRO 12 season begins against Zebre on 7th September.
Injured Welsh rugby star Owen Williams took to Twitter this weekend to express his thanks to the many people who have wished him well.
The Wales and Blues centre suffered a significant injury to his cervical vertebrae and spinal cord, while playing in Singapore in June.
The 22-year-old posted a picture from hospital, with his pet dog Riley.
Cardiff Blues have launched a fundraising and awareness campaign to support Williams as he makes his recovery.
Cardiff Blues and Wales centre Owen Williams has been moved to the Welsh Spinal Injuries and Neurological Rehabilitation Unit at Rookwood Hospital to continue his 'long-term recovery, the club has said.
Cardiff Blues have confirmed that Owen Williams has returned home to Wales following a serious injury playing in Singapore.
The Blues and Wales centre suffered "a significant injury to his cervical vertebrae and spinal cord" playing in the World Cup 10s on June 22.
Williams was flown back by air ambulance and is now being assessed and monitored at the University Hospital of Wales in Cardiff.
"Cardiff Blues and the Williams family would like to take this opportunity to pay tribute to all the staff and specialists at Tan Tock Seng Hospital in Singapore for their care and support for Owen following his injury", a spokesperson said.
They also thanked well-wishers for "overwhelming messages of support".
Wales captain Sam Warburton told ITV News that "everyone is devastated" at the news of Cardiff Blues teammate Owen Williams' injury.
The region confirmed today that the 22-year-old centre suffered "a significant injury to his cervical vertebrae and spinal cord" playing in the World Cup 10s in Singapore on Sunday.
Warburton said: "We're absolutely gutted for him and his family. All of us are keeping our fingers crossed - and hopefully he comes back home safe and sound."
Cardiff Blues have confirmed that centre Owen Williams has suffered a "significant injury to his cervical vertebrae and spinal cord."
The 22-year-old, who has played four times for Wales, was injured playing for Cardiff Blues at the World Cup 10s on Sunday.
The region said that he underwent an operation on Monday to stabilise a fracture and is currently recovering in hospital in Singapore.
His family and Blues staff are with him in hospital, and arrangements are now being made to arrange his safe transfer home "at an appropriate time."
The region and Williams' family have also thanked hundreds of people who have offered messages of support.