Sanches was labelled a "big doubt" by boss Paul Clement in his pre-match press conference after he picked up a thigh strain on international duty with Portugal.
Swansea will also make a late decision on Bony who has been troubled by a nerve problem in his calf which has caused him to experience tightness in his hamstring.
"We are monitoring Wilfried closely, he rejoined training today. We will have to assess him over the next couple of days and see how he is. He is 50/50 for a start," said Clement.
“He went away and they, the Ivory Coast, did a scan, which showed a little bit of something in the calf.
"But it wasn’t clear whether that was an old injury and showed a bit of scar tissue which was affecting a nerve which went up to his hamstring.
"That basically happened. He was good to go, given the all-clear by us and the Ivory Coast but he didn’t feel comfortable and, at that point, he said ‘It’s best that I don’t take part’.
"So he returned and came back last weekend and he had treatment for the first couple of days and was reintegrated back in individually, and then he rejoined the group on Thursday.
"That's the point where we're at. I'll speak to the medical staff and to Wilfried about how he feels and whether he thinks he can contribute on the weekend."
But there is better news on Nathan Dyer (Achilles) and Ki Sung-yueng (knee) who are available for the first time this season.
Provisional squad: Fabianski, Naughton, Fernandez, Mawson, Olsson, Britton, Clucas, Carroll, Fer, Ayew, Abraham, Nordfeldt, Rangel, Van der Hoorn, Mesa, Sanches, Bony, Fulton, Narsingh, Routledge, Dyer, McBurnie.