This comes after the striker was linked with a move to Mamelodi Sundowns, Kaizer Chiefs and Orlando Pirates.
“Rusike is not for sale‚” he told TimesLIVE.
“We are adding four players to our squad‚ we are not selling anyone.”
United have already signed Thamsanqa Gabuza and Kudakwachi Mahachi from Pirates.
Reports suggest that the Pretoria-based club is set to lose Aubrey Modiba and Bradley Grobler, while Tebogo Mokoena is set to jet off to Europe for a trial stint with an unnamed European side.