Walker had surgery after tearing a hamstring in December's Heineken Cup win over Treviso at Liberty Stadium.

He then had to watch as Ospreys team-mates Shane Williams and Tommy Bowe went on tour to South Africa with the British and Irish Lions.

But Walker declared himself fit and raring to go for the new season ahead.

"It's great for the Ospreys and for us as individual players to be competing for a place," Walker told BBC Sport.

"I'm happy to be back in training, I was out for six months, which is a pretty long time to be out of action, but I'm feeling pretty good at the moment and I'm enjoying being able to participate fully with the guys.

"It's always an exciting time for a professional sportsman, it's when optimism is at its highest and there's always a buzz about the place.

"That's especially the case this year, we've got new boys in who have brought a bit of a spark and Scott Johnson has changed a few things around as well so the atmosphere around the place is great.

"The possibility of getting back into the Scottish squad will be there but only if I've reached the required standards here at the Ospreys."