Ntuli and Ngele have returned to Sundowns from loan spells with Platinum Stars and SuperSport United respectively, having previously failed to secure regular game-time with the Absa Premiership champions.
Ntuli recently declared a willingness to fight for Mosimane's favour, but the big striker - who has attracted interest from Bidvest Wits, AmaZulu and Maritzburg United - has been separated from the pack, as has Ngele.
According to a source, Downs plan to finalise the departure of a few players after the side returns from their CAF Champions League Group C clash with AS Togo-Port on July 17.
"Ngele and Ntuli are training separately from the rest of the team," says the source.
"The club will be in a good position to clear up their future when they return back from Togo."
Ntuli joined the Brazilians from Golden Arrows in 2014, while offensive midfielder Ngele linked up with the side four years ago from Dikwena.