What's the latest team news?
There are seemingly no new injury scares following the win up at Blackpool on Saturday.
Will Vaulks and Marley Watkins were brought in to strengthen the City bench at the weekend with players getting fitter and fitter with each passing week.
Kieffer Moore came on to score his first goal of the campaign up at Bloomfield Road, too, so he could be in line for his first league start against Peterborough, although Mick McCarthy did lavish praise on James Collins' performance against the Seasiders.
Lee Tomlin and Isaak Davies are all still absent through injury at the minute. They are the only players of any concern this week.
Isaac Vassell getting himself fit and played in under 23 game yesterday.
As for Posh, there are injury question marks hanging over two key players in Jonson Clarke-Harris and Jack Marriott, both of whom manager Darren Ferguson said were "nowhere near" fully fit in the win over Derby at the weekend.
Jack Taylor will likely miss the clash due to a hamstring injury, while Sammie Szmodics was left out of the squad for the Derby game as he had become a father for the first just days earlier. It is unknown whether he will return in time.