Chippa United first started negotiating with Cosmos owner Jomo Sono for the services of Mashumba, but they now face competition from Rise and Shine.
"Mashumba was set to join Chippa United. However, Jomo has received another offer from Polokwane City," says a source.
"The player might now be signing with Polokwane City."
Mashumba has scored four goals in the National First Division since rejoining Ezenkosi on a free transfer in October, 2018 after a brief stint at Algerian giants USM Alger.
He notably struck 17 times in 2014/15 for Cosmos in the NFD.