Jon Fallon (knee) will be checked later in the week while York assistant coach Chris Thorman will also monitor the performance of the Knights’ reserve team when they play on Thursday night.
“There are some spots up for grabs on Sunday for whoever plays well in the reserves,” said Thorman.
“Nobody is safe and you have to play well every single week to earn your jersey. We need to get back to proving ourselves. We’ve had some tough training sessions this week and hopefully it’s been a bit of a reality check for some of the boys.”
Thorman added: “I’m well aware of the threat that the Scorpions are going to pose. Their past couple of results have shown that they know how to win a game and we have to respect that, but it’s a home game for us and after last week it’s all about us this week.
“We’ve had a week to think about poorly we started last week’s game against Workington and we want to get over that this weekend.”
Scorpions trio Craig Richards, Steve Parry and Barrie Phillips will all face late fitness checks.
David James and Jamie Murphy are to likely to keep their places while Harri Greville impressed as a late call up last week and is pushing for another start this week. Neil Dallimore is back in contention after a bout of illness.
South Wales coach Anthony Seibold said: “The game against Doncaster showed that each and every away game will be a big challenge for us.
“We know that York, as one of the competition favourites, will be looking to bounce back after their away defeat to Workington last Sunday. Any side that contains players like Chris Thorman is likely to be very dangerous, so we know that we are the underdogs in this encounter.”