Arter missed the game against Newcastle United with an Achilles injury, while Stanislas has been struggling with a hamstring injury.
The manager also revealed that Callum Wilson is continuing to make good progress in his rehab.
"We'll make a late decision on Harry," Howe explained.
"He missed the Newcastle game and we'll leave it late again. Junior has a hamstring injury and he'll miss the Swansea game, he's still recovering and he'll be a little longer.
"Callum is making good progress, I think next month is possible but we're not rushing Callum or saying that will definitely be the case."