Midfielder Williams could start, with head coach David Wagner to decide whether to rest Australia international Aaron Mooy against the Swans.
Club record signing Steve Mounie is back in training after missing three league games due to an inflamed heel and may be involved.
Collin Quaner (calf), Kasey Palmer (hamstring) and Michael Hefele (Achilles) are still out.
Provisional squad: Lossl, Lowe, Malone, Schindler, Jorgensen, Smith, Hogg, Williams, Mooy, Billing, Van La Parra, Ince, Kachunga, Depoitre, Mounie, Green, Sabiri, Cranie, Hadergjonaj.
Luca Toni believes Bayern Munich should sign Inter Milan hitman Mauro Icardi if Robert Lewandowski departs the Allianz Arena.
Leonardo Bonucci has played down reports that he could leave AC Milan by insisting that he does not have a problem at the club.