Team managing director Shaun Frayne said Buchacher and Sanders, who signed for the team in December last year, would add much value to the set-up in 2018.
“We are extremely excited about the prospect of these two talented, up-and-coming riders,” he said.
“We believe they have the potential, competitive spirit and determination to take women’s mountain biking to new heights.”
The pair will join current team members Nico Pfitzenmaier and Candice Lill.
“Our four chosen ambassadors have what it takes to succeed in cycling.
“Not only do they embody the determination, commitment and hard work associated with dormakaba SA, but also our brand values of trust and performance.
“We are truly proud to be associated with them,” he added.
Buchacher, who crossed over to mountain biking in 2015, will be competing locally and internationally this year.
“I am aiming high and determined to achieve new and greater results,” she said.
Sanders, who has been successful in three cycling disciplines in the past – road racing, cross-country and marathon – progressed from amateur status to being a successful professional rider in recent years.