Watt moves closer to return.
The U's were resolute and creative in their win over Gillingham, and will look to build on that as cup football comes to the Weston Homes Community Stadium.
Sanchez Watt missed the weekend game against the Gills, but has been named in the squad for the visit of the Posh, as he moves closer to a return and his second competitive debut for the U's.
His return bolsters the squad that travelled to Kent on Saturday and the U's will be hoping to make cup progress, before the weekend visit of Port Vale to north Essex.
Remember, there are special prices on offer for this match, so grab your ticket in advance of the game on 0845 437 9089 or via www.colutickets.com.
U's: Walker, Cousins, Wilson, Olufemi, Thompson, Pappoe, Eastman, Okuonghae, Dickson, Izzet, Eastmond, Bond, Bean, David Wright, Gilbey, Massey, Sears, Drey Wright, Morrison, Ibehre, Watt