Coetzee missed Ajax's 2-1 victory over Polokwane City on Saturday evening after picking up a knock in Bafana Bafana's 3-1 loss to Mauritania in an Africa Cup of Nations qualifier on September 5.
However, the centre-back is set to return against the Glamour Boys in Port Elizabeth.
"He [Coetzee] will be fine and I think he'll go through a full session on Monday," De Sa said.
"It was just a little bit too soon after his injury so he'll be ready to play. It was to give him a proper rest.
"Playing on the artificial surface can be very testing on the joint but he'll be ready."