But with Charteris' wrist surgery and international commitments, as well as Morgan's and Jones' injury woes, Sidoli has made the lock position his own, starting ten of the last 11 games.
And despite turning 33 this June and winning his 42nd and last Wales cap almost three years ago, Sidoli is adamant his international days are far from behind him after rediscovery his form this campaign.
"You are as old as you feel and I feel 22 not 32," Sidoli told the Newport Gwent Dragons club website.
"I like playing every game and if there is only one fit recognised lock out there at the moment that's fine by me because I want to play every game.
"It's unfortunate three locks have been injured because there was great competition for places in the side, but I've still got a huge hunger for the game.
"People might see me as a player from before but I still want to be regarded as a player for the future and one with a big hunger.
"I'd like to add to my 42 caps for Wales and I see that as a great challenge, but I'm up for that."
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