Albion will travel to the winners of Bristol City and Swansea City in the fourth round of the Emirates FA Cup if they progress past Chesterfield in the third-round replay.
The Baggies drew 3-3 with the Vanarama National League side on Saturday afternoon, with Brandon Thomas-Asante heading in an injury-time equaliser at the Technique Stadium.
Bristol City and Swansea City drew 1-1 on Sunday lunchtime.
Albion's replay with the Spireites takes place at The Hawthorns on Tuesday, January 17.
The fourth-round tie is scheduled to be played between January 27-30.