Banyana hold a commanding 2-0 first-leg lead as they look to secure qualification for this year's Women's Africa Cup of Nations tournament.
"They know the magnitude of the game," Ellis said.
"It's not over yet and we had a lot of opportunities to seal it back in South Africa. But we've got to make sure that we are more clinical in front of goal.
"But also be confident that we do not concede. The player's mentality is on another level at the moment during the training session.
"We've had a day-and-a-half of travel and everyone has shown their eagerness during training and I'm very excited that we want to show what we're capable of."