Rosier has played in the T20 event before, turning out for Griquas in his first tournament back in 2015.
"I'm looking forward to the new challenge of playing for a new team and establishing myself in the side. It will be a great experience coming up against a couple of franchise players and national sides such as Zimbabwe," Rosier commented.
He and the rest of the Northerns Seniors side are also very keen to add to the burgeoning trophy cabinet at SuperSport Park Centurion.
"Our coach has prepared us for the challenge that lies ahead in the next two weeks. In T20 cricket you can't really put numbers on anything, so our main focus is ensuring the team does well and hopefully advance to the finals next weekend and bring another trophy back to the Union."
Rosier also took part in the Titans Bash recently, which was ideal prep ahead of a tough Pool, against the likes of Gauteng and Free State, who he is familiar with.
"The Bash is such a good initiative and to play with and against franchise player, which settled our nerves ahead of the Africa T20 Cup. With me having been involved with the Free State last season, I am aware of what they have in store so from a team point of view we're ready."
Rosier's sentiments were shared by coach JP Triegaardt, who has spent much of the winter preparing his squad for this early season tilt at success.
"We've been training now for the past three months, working on various aspects, and ultimately preparing for the upcoming season.
“This competition is a great opener to the start of the season. If we can begin our season on the back of a successful Africa T20 Cup that will be massive for us, taking that momentum into the new season," Triegaardt explained.
With a happy blend of hardened experience, and some youthful exuberance, the coach is looking forward to a challenging weekend.
"If you look at our pool - it is one that has a lot of depth, with Gauteng, Free State and SWD, as well as national sideZimbabwe. But we have guys in our side who can win games, so it will make for a great contest."
Triegaardt has had to make a late change to his plans, owing to injury in the lead-up to the Pool B action in Oudtshoorn.
"There's one change to our squad with Ruan de Swart ruled out after injuring himself in a warm-up game against Gauteng. Donavan Ferreira is his replacement.
“Donavan performed remarkably well in the Bash last weekend, and will add a lot of value to the side."
Northerns kick off their challenge against Free State this morning, before back-to-back fixtures against Zimbabwe and hosts SWD on Saturday. They round off their week with a clash against neighbours Gauteng on Sunday.
Northerns squad (from): Diego Rosier (capt), Neil Brand, Leus du Plooy, Gionne Koopman, Rubin Herman (wk), Luvuyo Nkese, Gregory Mahlokwana, Victor Mahlangu, Samuel Mofokeng, Mitchell van Buuren, Jiveshin Pillay, Ruben Trumpelman, Donovan Ferreira