The Yorkshireman comes into the race off the back of winning a gold medal in the cross-country mountain biking at the Olympic Games in Tokyo.
He will be in support of his team leaders of Egan Bernal, Richard Carapaz and Adam Yates over the upcoming three weeks.
Speaking in the pre-race press conference, Pidcock said he wasn't putting expectations on his three-week race debut and was there to learn. The 2021 season is Pidcock's first pro season at WorldTour level.
"First Grand Tour, I'm looking forward to it," Pidcock said.
"I have no goals. I'm just here for the experience, with no expectations for results or anything. And then to ride with Egan, he's won two Grand Tours already. So it's a lot to be learned from him, I think and I look forward to helping him at this race."
Pidcock said that people should really forget about him riding the race as he is not expecting to bring anything in the first week before adding: "I mean, I guess plans can change pretty quickly. Maybe I start feeling good. Motivated again.
"At the moment, I look forward to helping Egan, Richie and Adam and working with those guys. I think that's also kind of a nice thing to do your work for the team-mates with no pressure."
Pidcock has been soaking up the moment after winning his gold medal in Japan, explaining that he does not have the form to deliver results in Spain.
"Is it difficult [coming to the race after the Olympics]," Pidcock said. "I mean, I certainly don't have much hunger at the moment. Everyone advised me to celebrate it [gold medal] properly because I move on quite quickly normally, so that's what I've done.
"I've enjoyed every minute since. I've just kind of kept enough fitness so that I'll be able to race for three weeks, basically. I'm certainly not in top shape, not fully motivated, [but] certainly going to enjoy it."
He added how it has been very special coming back to the UK and being recognised on the street after winning his gold medal. The 21-year-old said the gold, which he took on his first attempt, won't alter his focus as begins his road career in earnest.
"I think it doesn't affect my career path," Pidcock added. "It was my biggest goal of the season and now I've achieved it. So yes, kind of now refocusing towards the Worlds in September hopefully gaining experience and strength also."
The World Championships road race takes place in the Belgian city of Leuven over a hilly course that includes a few cobbled sections too. It could potentially suit Pidcock, though he would have to battle against some of the biggest names around for the rainbow bands.
Pidcock said he was keen to focus on the Classics at the beginning of his career, particularly Paris-Roubaix, but admits at some point he will make the transition to competing for the overall in stage races.
"I certainly do want to transition to ride GC at some point but that takes more time and energy and this kind of high pressure," he said. "But I would say so. I mean, there's not any rush to go that way too soon."
The Vuelta a España 2021 starts in Burgos on Saturday, September 14 with a 7.1km prologue as Ineos Grenadiers come in with some of the big-name favourites for the race.
Thank you for reading 10 articles this month* Join now for unlimited access
Enjoy your first month for just £1 / $1 / €1
*Read 5 free articles per month without a subscription
Join now for unlimited access
Try first month for just £1 / $1 / €1