Ezenkosi qualified for the three-team mini league by beating Super Eagles 3-2 on Sunday, with Sono determined to keep his men focused on gaining promotion to the Absa Premiership from the National First Division.
The play-offs feature the second and third-placed teams in the NFD, and the side that finishes second-from-bottom in the Premiership.
The victor will advance to the topflight next season alongside second-tier champions Highlands Park, who will take the place of relegated Platinum Stars.
"There is no excitement because the bigger part is just about to start," Sono tells KickOff.com.
"Reaching the play-offs is good but we have achieved nothing so far."
Asked about his club's good record in the play-offs, the former Bafana Bafana coach is only looking forward.
"I don't believe in that you know. I'm not a believer in something that happened a long time ago, especially in football. Brazil was beaten 7-1 by Germany at home. So in football you cannot guarantee anything. You cannot go with the history of winning the play-offs previously because the players are not the same. When we won the play-offs we had certain types of players and now we have a different set of players. And characters will never be the same, so we'll just go out there and compete."
The legend's ambition of gaining promotion was questioned by many when he decided to sell star players Linda Mntambo, Mxolisi Macuphu and Freddy Nsabiyumva to PSL outfit Chippa United in the January transfer window. But he says he was never bothered by such talk.
"You know I never worry about what people say, whatever they said I didn't care. I just worry about me. Ja, I'm selfish, I worry about me because I came in this world alone, I didn't know there were other people. If you listen to people you won't go anywhere because people have got different opinions. By listening to what they say you will end up losing your way. You need to focus on the job in front of you. Me, I don't listen to people, I do what I think is right.
"Now it's up to the boys, now they have to go out and fight. So I will try and help them because at one point in time we were number 10 and nobody thought we would be in the play-offs. But 'mina' I always believe that there's nothing impossible in life. Anything is achievable in life.
"To win the play-offs you have to run and run and run. Chase the ball, chase the ball and chase the ball. Forget about these build-up things. It's your chance, so make sure you score and run for 90 minutes. You will only be restricted when you get home. You must never stop running; you run back, you run forward."
Cosmos' last game of the regular season will be against third-placed Black Leopards at Thohoyandou Stadium on May 6.