That means playing new signing Bali Mumba in one of the full-back positions and making the usual difficult choice of who should partner Siriki Dembele up front.
My team to face Bristol Rovers in a third round FA Cup tie is here. It’s a midfield diamond formation.
5. JOSH KNIGHT
The centre-back has started to show the form that persuaded Posh to sign him in the summer. His partnership with Edwards still needs work so they must stay together tomorrow.
6. OLIVER NORBURN
The captain is not likely to be left out now is he? And nor should he be. Norburn to stay the base of a midfield diamond.
7. JACK TAYLOR
Taylor must play, but I'm shifting him to the right of the midfield diamond tomorrow. He's that bit quicker and more athletic than Jorge Grant so will cover the open spaces better. He should still be able to take pot shots at goal and arrive in the area to get on the end of crosses.
8. HARRISON BURROWS
One of the most enthusiastic members of the squad deserves to keep playing. His energy is vital in a midfield diamond.