They meet at the Swansway Stadium later with the original game postponed in August.
Severe storm damage has just been repaired and for Chester they made a welcome return on Saturday.
A 5-3 win over Bradford Park Avenue was far from perfect but another three points tonight moves them level with four clubs sitting on 11 points.
Managerless United are bottom and need to start picking up victories - a win takes them out of the bottom three.
"FC United will come here, they’ll have two new interim managers in charge who will just say go out and play,” predicted Blues joint manager Bernard Morley in the Chester Chronicle.
“They’ll feel like they can come and exploit us, but it’s down to us to toughen up, be organised, our game management has got to improve, cut the silly mistakes out.
“I think we’ve got the goal that was set out before we started the season and we’re starting to see signs of that now.”