Justin Burnell’s side need all the positives they can muster given they have won just once in their last eight league outings.
Foley replaces Lee Millar for the home game with Ealing Trailfinders who have emerged as top-four contenders after finishing 11th last term.
“They have this year invested heavily in their playing squad and brought in some real quality,” said Burnell.
“They are a well-rounded side who perform well at the set-piece, are combative at the contact area and their backline offers real threat going forward.
“So we’re aware what a good side they are, as they wouldn’t be where they are in the table if they weren’t. But for me it’s all about us and we’ll be totally focusing on ourselves and what we want to do in the game.”
Doncaster Knights will look to keep alive their faint hopes of catching second-placed Yorkshire Carnegie when they head to London Scottish today.
Clive Griffiths names an unchanged starting XV after the win at Nottingham but Connacht prop Saba Meunargia is set for his debut off the bench having arrived on loan from the Pro 12 side last week.