The inaugural event at Twickenham next week sees clubs from across the world converge on London for a two-day sevens feast and Diggin is hopeful the sport can continue its increasing popularity.
"Sevens is great pre-season preparation because it gives you lots of time on the ball and puts a real emphasis on technique. You have to get things right with the ball in hand and also at the break down. For these guys this is good experience.
"It's a quickly growing sport and it's great to get clubs from round the world playing at the World Club 7s.
"With the Olympics coming up you see more and more countries paying more attention to it. If you talk to guys like Vas [Vasily Artemyev], Russia are starting to put more focus and money into 7's and that's great for the sport."
Artemyev, who's also in the Saints squad for Twickenham, believes the World Club 7s, as well as its inclusion as an Olympic event, will be great for the growth of the game as a whole.
As well as helping develop younger players within the squad, the Russian international said he's looking forward to a bumper crowd at Twickenham and competing against a whole host of different sides from across the world.
"Sevens is really taking off, especially with the Rio Olympics coming up and it'll be great to play in front of a decent crowd at Twickenham," said Artemyev.
"It's a frantic game, I don't know if it's more exciting to play or to watch to be honest, it will be good playing against clubs from other nations.
"People like Carlin Isles have taken the rugby world by storm and it's always good to come up against new sides and players.
"We're certainly looking at winning the tournament. We never go into a game thinking we can't win it and that won't be any different next week.
"I'll be looking to play as much as possible but also help some of the younger guys out with some experience."