Mosimane signed Ghana’s number goalkeeper Razak Brimah during the transfer window, even though he has Onyango and Kennedy Mweene, who are number one goalkeepers for Uganda and Zambia respectively.
Mosimane has so far been rotating Onyango and Brimah, while Mweene and fourth choice shot-stopper Thela Ngobeni wait for their turn in goals.
With the constant changes in goal, Sundowns are unlikely to have any consistency at the back.
Brimah, who has previously represented Ghana at the Africa Cup of Nations, did not have a good game against AmaZulu, making errors in their 2-1 defeat to Usuthu at Lucas Moripe Stadium on Saturday. Sundowns have conceded seven goals in six matches and Onyango admits they need to improve.
“It’s very difficult for all of us because are all internationals and number ones for our countries. This gives the coach a little bit of a headache to choose who should start, but whoever plays I think can give the best for the team,” Onyango tells KickOff.com.
“We have conceded goals in the previous games which means we must work a little bit harder to get more clean sheets and give the team confidence. We have managed to score, but we have not managed to keep clean sheets and it’s not good for the confidence of the team.
“It’s healthy competition between four goalkeepers because there’s also Thela waiting on the sidelines. We still need to work harder to help the team to get into a position where we want to be.”
The Ugandan captain says he did not get a chance to speak to Brimah after the AmaZulu match, but they will come together as goalkeepers to see how they can improve going forward.
“Not really because it’s not really easy to talk to a player when a game like that happens. It’s always emotional and we all don’t look to blame each other because we all make mistakes,” he says.
“It’s a little bit of a challenge because he is coming from Europe, which is a different atmosphere to South Africa. As goalkeepers we know these things happen. As goalkeepers we will sit down and see how we can rectify our mistakes and help each other.”
Sundowns will begin their Telkom Knockout campaign with a tricky last 16 clash against Chippa United away from home on Sunday.
Sundowns are determined to finish the year with silverware in the cabinet, but Chippa will not make it easy for them.