Aston Villa midfielder Jota will be absent for the visit of Brighton this weekend after undergoing a hernia surgery that is set to sideline the Spaniard for the next couple of weeks.
Villa welcome back Ivory Coast forward Jonathan Kodjia following a fractured cheekbone while Bjorn Engels is also available after collecting an injury in the 5-1 win at Norwich before the international break.
Fellow centre-half James Chester has stepped up his recovery from a hamstring complaint but the Villa Park fixture is set to come too soon for the Wales international.
Belgian winger Trossard, who has not featured since late August because of a groin problem, has returned to training, while centre-back Duffy managed two games for the Republic of Ireland during the international break having previously been sidelined by a calf issue.
Aston Villa provisional squad: Heaton, Guilbert, Engels, Mings, Taylor, Nakamba, Targett, McGinn, Grealish, Trezeguet, El Ghazi, Wesley, Hourihane, Kodjia, Elmohamady, Steer, Konsa, Davis, Lansbury.
Brighton provisional squad: Ryan, Montoya, Dunk, Webster, Burn, Alzate, Mooy, Stephens, Gross, Maupay, Connolly, Button, Bong, Balogun, Duffy, Propper, Bissouma, March, Jahanbakhsh, Trossard, Murray.