"I've been warned by George to stay on my line,” Khune told the media during a press conference at the Medshield offices in Randburg on Wednesday.
Lebese, who left Chiefs last year for Downs, remains a close knit with the Amakhosi shot-stopper but it’s still not clear whether he will feature or not against his former employers.
Th winger has found it tough to crack the whip at the star-studded Brazilians, but he is sure that his teammates will deliver the goods on Saturday.
However, Kekana believes that Amakhosi are a dangerous side having won the last two meetings between the two clubs.
The Sundowns captain calls on his troops to adopt a smart approach and be extremely cautious from the first to the last whistle at the majestic FNB Stadium.
"When you play against Chiefs, you have to concentrate for the full 90 minutes," he said.
"They won the last two games against us, so you can't just there [to FNB] and try to be smart. You have to be very cautious,” he continued.
Following the acquisition of Leonardo Castro from Downs, Kekana believes the Glamour Boys pose much more of a threat now especially with the Colombian striker on their books.
"As players, we are much aware of Chiefs' threat, especially with Castro,” Kekana said.
The 26-year-old, who announced himself to the Amakhosi with the winner over the weekend against Baroka FC, will be facing his former side for the first time since his high-profile move this earlier month.
Steve Komphela’s holds the upper hand going into the clash after winning the last two encounters, both with 2-1 scorelines.
Downs last victory came in a 3-1 triumph that came en-route to their 2015/16 PSL championship triumph at the Loftus Versfeld Stadium.