Saints have spent upwards of £30million this summer bringing in new talent, although the most impressive player so far has been academy graduate Ward-Prowse.
The midfielder has shone in Saints' opening Premier League matches, in which he was joined by fellow 18-year-olds Luke Shaw and Calum Chambers in the starting line-ups.
The latter will join up with England Under-19s and team-mate Rickie Lambert will be with the seniors over the upcoming international break, while Shaw and Ward-Prowse will be hoping to make their debuts for the Under-21s.
"It's the next step on the international ladder, and it's one away from the first team," the midfielder, who was part of the Under-20s World Cup squad in the summer, said.
"You've seen the likes of Ross Barkley and Andros Townsend do it, so it's in the back of my mind that - if I can carry on my good form - hopefully I can push my way in there.
"To be called up for the Under-21s at my age is a real achievement for me, so I'm happy with that.
"I'll just concentrate on myself and the club, and I will be recognised if I'm doing well. I'll meet up with the team, try to impress the manager and take it from there."
Ward-Prowse has impressed thanks to a maturity that belies his years, intricate passing and, most glaringly, his ability to take set pieces.
He has been handed the responsibility of getting the ball into the box by manager Mauricio Pochettino and took the free-kick from which Jose Fonte equalised against Sunderland last weekend.
"The manager put me on set-pieces during pre-season, so I knew I had to constantly work on them," Ward-Prowse said.
"Nowadays set-pieces make a big difference in matches - they can decide whether you win or lose a game, as it proved last weekend when Sunderland scored from a corner and we scored from a free-kick.
"If you can put the ball in the right area when you've got people like Lambert and Jose in the box, you know they'll put it in the back of the net.
"It's nice to have that responsibility, and I am embracing that and the pressure of it. I model myself on the likes of Steven Gerrard and David Beckham, who are set-piece experts.
"I stay out for an extra half-hour or so after training to take a few corners, free-kicks and shots so that I'm in the mind-set for the weekend."
Saints return to Premier League action at Norwich tomorrow on the back of a 5-1 midweek Capital One Cup second-round win at Barnsley.
Ward-Prowse was an unused substitute at Oakwell, where fellow youngsters Harrison Reed, Omar Rowe and Jake Sinclair made their debuts.
"I was happy to be in and around the squad on Tuesday and to see some of the young lads come onto the pitch," he added.
"I was there to support them because that was me a couple of years ago, so it was good for me just to be there to help them through. Hopefully I'm all rested up now and ready to go tomorrow."