The Villa midfielder made his first Premier League start exactly a year ago on Thursday.
The Potters midfielder is in line to miss his first Premier league game of the campaign.
West Ham United are set to welcome back James Collins and Sam Byram to training tomorrow.
The Crystal Palace boss has been discussing Norwich's 3-2 win over Newcastle.
Liverpool take on Borussia Dortmund in the Europa League this evening.
Wolverhampton Wanderers winger Michal Zyro is expected to miss up to a year's worth of action through injury.
Borussia Dortmund and Liverpool will face each other in the Europa League this evening.
The Hammers are currently pushing for a top four place.
Reports this week suggested that Williams was on his way out of the City Ground already.
The West Bromwich Albion manager has suggested he might use the remaining weeks of the campaign to blood more youngsters in the first team.