The shot-stopper has been a key component of the log-leaders' success, and they may need to play the remaining fixtures of the season without him
Sandilands injured his shoulder during the Nedbank Cup game against Bidvest Wits recently.
The Bafana Bafana goalkeeper's injury forced him to miss the drawn League game against Bloemfontein Celtic last night, he was replaced by Calvin Marlin who managed to keep a clean sheet against Siwelele.
"I sat out of the game against Celtic because of the injury I got against Wits recently," Sandilands told KickOff.com.
"It has to do with ligaments in my shoulder for which I am receiving treatment daily. I am hopeful that I will bounce back before the end of the season,” he added.
Sandilands praised Marlin for a good performance during the Celtic game on Wednesday night.
"It was disappointing not getting the result. But a point away from home is better than nothing.
“I can't pick an individual because at Sundowns we defend as a team but there is no doubt that the club has quality goalkeepers as Marlin showed against Celtic," he added.