Darren Ferguson's side will also be aiming to set their poor away form aside, after losing the previous five matches on the road.
West Brom will be stronger in defence after having several absentees for their defeat to Queens Park Rangers.
Fellow centre-back Kyle Bartley will also be restored into the Albion line-up after being sidelined with a knock for the last game.
Peterborough won't be able to count on new signing Callum Morton after joining on-loan from the Baggies, he'll be ineligible for the showdown with his parent club.
Meanwhile, long-term absentees Jack Marriott and Joel Randall will miss out but should be available for selection by the end of February.
(3-4-3) Johnstone, Clarke, Bartley, Kipre, Townsend, Livermore, Molumby, Furlong, Grant, Dike, Phillips
(4-3-1-2) Cornell, Mumba, Knight, Edwards, Thompson, Taylor, Norburn, Burrows, Grant, Clarke-Harris, Dembele
Posh haven't won an away game in five attempts and will be hoping for a victory this Saturday.
Despite a heavy defeat against Coventry City, Ferguson's side currently sit only three points away from safety in the league.
Albion should have the boost of extra minutes available for new signing Daryl Dike after he passed through another week of his intense training schedule.
Dike brightened up Saturday's defeat to QPR, if only temporarily, and the American striker is thought to get his first Baggies start in this one.
However, Ismael has come under fire from the Albion fanbase after a run of poor form, his side are without a win in four league games and must put in a good performance to ease tensions and gain momentum.
Ones to watch
Upon his return from injury, Phillips put in a good shift in his comeback gig against Brighton.
Traditionally a winger, the Scottish international has been deployed as a number-nine quite frequently so far this campaign.
Bagging a goal in the loss to Coventry, Grant has proved to be Posh's most creative threat throughout the season.
These two sides last met in August, where the Baggies were fresh off an unbeaten league run.
Posh provided stern opposition last time out and provided a template for other Championship outfits to use when facing West Brom.
Their rigid approach to the fixture meant it took a 94th-minute winner from Semi Ajayi to clinch all three points.
Before that win, the last game between the two sides came in an FA Cup round four replay.
Albion clinched victory via a penalty shootout after a rare Darren Fletcher goal cancelled out a Jon Taylor opener for Posh.
How to watch