The former Bafana Bafana captain, whose contract was not renewed by Everton, has been training with the Black Cats as he tries to earn him another contract.
“Steven is still here – he has done very well. We thought about maybe including him in the Under-23 game on Sunday, but we will probably train him more and get him ready,” Moyes told Chroniclelive.
“He is very good on the ball, doesn’t give possession away too often. He is a tidy player but we would probably rather wait another week or so to see where he is at.”
Meanwhile, as reported earlier, Orlando Pirates remain hopeful of signing Pienaar despite the former Everton midfielder currently undergoing a trial at Sunderland.
Pirates administrative manager Floyd Mbele said the Buccaneers have tabled an offer Pienaar and were now waiting for him to come back to them.