Previously capped by Wales at schools level and U19, he was a part of the Welsh U21 side that did the Grand Slam in 2005 alongside current Ospreys Andrew Bishop, Alun Wyn Jones, Ian Evans and Tom Smith.
Davies came through the ranks at Newbridge RFC, before moving to the Galwegians club in Galway, where he also played for Connacht 'A' on a number of occasions. He returned to Wales in the summer of 2007 to sign for Neath, spending just one season there before moving to Sale Sharks. With two first team appearances for Sale to his credit, including a debut against Cardiff Blues in the EDF Energy Cup in October, he made an emergency loan switch to Worcester Warriors in April, making his debut against Harlequins in the Guinness Premiership.
Speaking after signing for the Ospreys, Davies said: "Signing for the Ospreys is an excellent move for me personally and professionally, and I'm really looking forward to pre-season and a new challenge. All the way through my career so far I've always looked to experience new things and new ways of playing, to play in different environments and to try different cultures. In 2005 I made the decision to go out to Ireland, to get away from where I had grown up playing rugby, with the aim of developing myself and it was a brilliant experience, I really enjoyed my two years there.
"Having been back in Wales for a season, I then had the chance to play in England with Sale, and again, like with my time in Ireland, I feel that I've grown as a person and a player for the experience. In my year playing in England I've played in the EDF Energy Cup and the Guinness Premiership, and I've learnt so much about my game from going up against the likes of Andrew Sheridan and Lionel Faure in training every day.
"I've had a great twelve months, but I'm excited about coming back to play rugby in Wales again with the Ospreys, I realise that playing over the border I may have dropped off the radar a little. I know that I face a real challenge to establish myself at the Ospreys with some really good tightheads already in the squad including a likely Lions starter but it's an exciting prospect. I want to learn from the likes of Adam Jones to become an even better player, and if I can go onto achieve half of what he has in an Ospreys shirt then I will be happy."
Andrew Hore, Ospreys Elite Performance Director, added: "The signing of Ross Davies is a significant one for the Ospreys, increasing our strength in depth at tighthead and ensuring we have adequate coverage in the position. With Craig Mitchell's recent elevation to the Wales squad and Cai Griffiths' excellent performances towards the end of the season, not to mention the considerable presence of Adam Jones, we will have real competition for this position next season.
"As an Under-21 Grand Slam winner, Ross has outstanding potential and the ability to lock out a scrum and we are excited about him being part of the squad working with our coaching team to help him realise this potential. Importantly, our signing of Ross means that we are bringing Welsh talent back home, allowing him to play his rugby in Wales.
"We are attempting to deliver sustainable success on and off the pitch, and a significant part of this is the identification of young Welsh talent and then providing them with a strong support structure to help them fulfil their potential."