Mackail-Smith, who is on 99 Posh goals, will partner Tom Nichols up front as manager Grant McCann switches to an attacking 4-4-2 formation. Marcus Maddison and Paul Taylor will supply the width.
Captain Chris Forrester returns to midfield, where there is no place for Leo Da Silva Lopes or Brad Inman.
Bradford are also expected to field a 4-4-2 formation.
Da Silva Lopes and Inman are on the substitutes’ bench alongside Harry Anderson. It’s Anderson’s first appearance in a matchday squad this season.
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Striker Lee Angol is not involved, He’s expected to move to a National League club on loan next week.
Posh: Luke McGee, Michael Smith, Andrew Hughes, Ryan Tafazolli, Michael Bostwick, Anthony Grant, Chris Forrester, Paul Taylor, Marcus Maddison, Craig Mackail-Smith, Tom Nichols. Substitutes: Junior Morias, Craig Brad Inman, Leo Da Silva Lopes, Mark Tyler, Jerome Binnom-Williams, Harry Anderson, Martin Samuelsen.
Bradford City: Colin Doyle, Tony McMahon, James Meredith, Rory McArdle, Nat Knight-Percival, Romain Vincelot, Josh Cullen, Alex Gilliead, Mark Marshall, Charlie Wyke, Alex Jones. Substitutes: Rouven Sattelmaier, Kevin Toner, Timothee Dieng, Billy Clarke, Jordy Hiwula, Matthew Penney, Daniel Devine.
Referee: Brett Huxtable.
Alan Swann will be at the match for the Peterborough Telegraph so check back for team news, a match report and a match report.
Aldo follow @PTAlanSwann on Twitter for live match updates.