Mlungisi 'Professor' Ngubane, a former coach of Khuliso Mudau at Black Leopards, has expressed his disappointment regarding the fullback's actions that led to his sending-off against Raja Casablanca on Saturday.
Mudau received a red card as Mamelodi Sundowns, already one man down after Bathusi Aubaas was also sent off, faced a 1-0 defeat in the CAF Champions League group stage match.
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The Group B fixture took place at the 18,600-seater Larbi Zaouli Stadium in Casablanca, Morocco.
Mudau was sent off following an incident where he punched an opponent off the ball.
"I was very disappointed with Mudau's actions. What he did was unacceptable," Ngubane tells KickOff.com.
"You are playing in an important Champions League match, and you choose to punch someone off the ball?
"Sundowns need to take action regarding this boy's behaviour.
"I thought he had changed after joining Sundowns, but it is clear he hasn't. When I was coaching him at Black Leopards, he often displayed this kind of behaviour. He lacks professionalism.
"While Mudau has performed well at Sundowns in terms of behaviour, I cannot speak to how he conducts himself off the field. He has anger management issues, and what he did was very silly.
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"Your team is already one man down, and they need an equalizer. You choose to strike an opponent off the ball, and even worse, in the opponent's half.
"I was very disappointed to see this from him. I did not expect such actions from an international player. Sundowns must address this boy's behaviour."
The Brazilians are back in continental action on Saturday, where they take on Maniema Union away from home in what is a must-win encounter.