Danish club Randers say that Mandla Masango training with SuperSport United without their permission is "unacceptable" and a violation of his contract.
Mandla Masango's Club Are Not Happy With Him Or SuperSport United

Now, with Randers' 2016 at an end, Masango is training with SuperSport United to keep himself fit during the off-season, something his parent club are far from happy about.
Randers' sporting manager, Ole Nielsen, told Amtsavisen that they were unhappy with the arrangement, and had informed both Masango and SuperSport of that fact.
"We have written to both Mandla and the club to tell them that it is unacceptable that he trains with another club, and that it is in complete violation of his contractual relationship. We have not received an answer, but we can see that he has received the message," Nielsen said.
"We know very well that many in the football world has friends criss-cross club borders and therefore we also do not mind players visiting a good friend in another club. In some cases, it may also make sense to train with another club to keep going, and I have also before given players permission to do that, but it requires that you ask first."
Masango has reunited with his former Kaizer Chiefs coach, Stuart Baxter, at SuperSport, and while the Englishman has stated that he would sign the winger if possible, he knows the player has a contract in Denmark until 2018.