Town and the Iron drew 0-0 in their first round tie at Sixfields on Saturday, and now know what the prize is on offer for the winners of the replay.
It is another tough draw, and means the Cobblers will face another all-Sky Bet League One tie if they can get the better of Graham Alexander’s men at Glanford Park.
The draw was made live on BBC2 on Monday night, with former Manchester United striker Andy Cole and ex-Bolton Wanderers forward Kevin Davies doing the honours.
The Cobblers have already played Doncaster in the league this season, with Town beating the south Yorkshire side 1-0 in Jimmy Floyd Hasselbaink’s first game in charge,
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The second round ties are scheduled to be played on the weekend of December 2/3.