The Harlequins front row was included in Warren Gatland’s touring side to New Zealand in 2017, something he says was beneficial in helping him cope with heavy workloads and quick midweek turnarounds.
And with the tournament rapidly approaching, Sinckler is raring to go.
“I’m a rugby player. I want to play rugby,” he said.
“I’m not very good at just sitting around – I want to keep busy.
“The Lions helped me with that because we had pretty short turnarounds on that Tour – sometimes Wednesday to Saturday.
“Sometimes guys had to double up, and in some cases triple up – it won’t be an issue for me to be honest, I’ll just have to focus on my recovery and keep my head down.
“Sport is a funny old thing – two years ago feels like 20 years.
“It was nice to be involved but it made me want to work even harder to fulfil my potential and continue playing well for Harlequins and my country if selected.”
Sinckler broke into Eddie Jones’ side a year after the Australian took charge of the national team, going onto gain 15 caps in the build-up to the tournament.
The 26-year-old is yet to play at a World Cup, nevertheless building considerable experience in the domestic game with his 137 appearances for Quins.
But the rugby-mad Sinckler insists he is no stranger to the history of the tournament and will not be fazed by being placed in the global spotlight.
“I’ve watched all of the World Cups,” he added.
Out and about making friends in #Miyazaki 📸#RWC2019 #CarryThemHome pic.twitter.com/SmHKwk9zYs
— England Rugby (@EnglandRugby) September 12, 2019
“2003 when we won it, 2007 when we lost in the final – (that was) brutal.
“I remember we got pumped by South Africa in the first game and I thought: ‘this isn’t going to be good’ but we got to the final – I watched them at home with my mum.
“Anything to do with England and sport – rugby, cricket, football – I love it. 2011 was a bit disappointing losing to France, and 2015 I watched it as well.
“They had a massive impact on me – I remember watching Jason Robinson tearing it up in 2003 and I wanted to be Jason Robinson.
“Then I looked in the mirror and I thought I’d probably go with Jason Leonard. I was still a back then but not for too much longer.”