Mudau signed an initial five-year deal with Sundowns when he joined from Black Leopards in 2020.
However, the contract will expire at the end of June, but the Premier Soccer League champions have an option of extending it by a year.
In the past, Mudau has been linked with a move abroad, a move that might not materialise owing to his age.
Potentially, Masandawana might lose Mudau after the Club World Cup if a solution is not reached, as hinted by his agent, Steve Kapeluschnik.