Broos' side - who lead the Group G standings - face a daunting clash against the Black Stars at the Cape Coast Sports Stadium on Sunday.
Avoiding defeat will be enough for the Begian's youthful Bafana side to advance to the next round of the Qatar 2022 World Cup qualifiers.
"We know what to do tomorrow which is not lose," Broos said.
"As long as we don't lose then we are one round further, so we have two opportunities.
"Ghana only have one option, which is only to win the match, which will not be easy."
After seemingly not being aware of the full Group G permutations after the Zimbabwe victory, Broos said that his side was now fully aware of the task at hand.
"I was totally wrong on Thursday after the game," Broos added.
"The only figure that interested me then was the final score and winning against Zimbabwe after we briefly looked at what was needed to qualify.
"But now we know what we need to do, and we didn't put in a good performance so that's why I thought Ghana needed to score three times.
"But still they have to win, and we will see tomorrow if they can."
Kick-off is at 21:00.