RNZ reports the Manu face hosts and defending champions New Zealand first up - pitting Tietjens against the team he coached for 22 years.
"We're going in there as the fourth seed in that pool, as the underdog really, so let's hope we can certainly turn it on and really play some great sevens," he said.
"It's a huge start for us playing New Zealand but, at the end of the day, if you're going to do well in this tournament you've got to play everyone and beat everyone really."
That's what we're about really - it's about one game at a time - and we'll look no further than New Zealand and then look at the others after that," Sir Gordon said.
Samoa will also face the United States and France in Pool C and one player looking forward to getting on the field is Tomasi Alosio, who missed the Dubai and Cape Town legs because of injury.
The 25 year-old is in his third season with the Manu Sevens and said Sir Gordon would a big impact on the team.
"The boys have gone much fitter than we were before and our sessions have just been at a high intensity with a bit of conditioning and a bit of Titch's specials at the end," he said.
"For a team like Samoa it's what we need - a very good coach to drive us and set high standards. Moving forward we believe there is a bright future for our sevens in Titch's hand so hopefully we improve bit by bit," Alosio said.