Rees made his 60th international appearance during the autumn in which time he has been part of both the 2008 and 2012 Grand Slam winning squads and toured with the Lions in 2009.
However the 32-year-old made just one outing as Wales retained their RBS 6 Nations title this year and that the 30-22 defeat to Ireland in their first fixture of the Championship.
He was left out thereafter with Richard Hibbard starting the remaining four games and Ken Owens carrying on as the replacement hooker after coming on for Rees against Ireland.
However Scarlets hooker Rees isn't prepared to surrender his position to Hibbard and Owens lightly, vowing to start once again for Wales before he retires.
"It has probably been the toughest couple of weeks of my career," Rees told the Western Mail. "I was starting against Ireland and then not to be involved at all after that was disappointing.
"I was frustrated with my own performance in the Irish game and the team's display because we gave ourselves too much to do to catch a quality side like that.
"But, credit to Richard, who has been playing some of his best rugby with the Ospreys. He was given an opportunity and he has taken it with both hands.
"The strength at hooker in Wales is as strong as I have ever known it. Richard and Ken now have had more experience over the last couple of years in the Welsh set-up.
"That is good for players because you want to be kept on your toes. If you go off the boil for a bit then you won't get selected and that is probably what has happened in my case.
"I have three or four years left in my career and want to finish on a high and that includes Test rugby.
"I feel as if I have a lot to give to Welsh rugby and hopefully hard work and dedication will get me back in that squad.
"It is about knuckling down and trying to get back in the team. I just have to come back stronger and prove myself."