The game at Fratton Park, which was postponed on 10th January because of a frozen pitch, will now take place on Saturday, 14th February.
Neither side has a fixture scheduled for that weekend as the 14th/15th February is the weekend that FA Cup 5th Round ties are to be played.
City were knocked out at the 3rd Round stage whilst Cup holders Pompey exited the competition at the weekend with a 2-0 4th round home loss to Swansea City.