Monday night's draw for the Fourth Round saw Northampton or MK Dons handed a home tie against Premier League champions Chelsea.
It puts a huge spotlight on next week's replay at Stadium:MK after a pulsating 2-2 draw at Sixfields on Saturday.
Chris Wilder's side will have learned of the draw on their journey down to Devon for Tuesday's clash with Plymouth Argyle.
That is a huge game for the Cobblers at the top of League Two but a potential Chelsea tie will be on another level financially for the club and the town.
The Dons replay takes place on Tuesday 19th January at 7:45pm.