On their official site, Wrexham anticipate a postponement of next Tuesday's game and have published this communication:
To: Clubs involved in matches still to be played in The FA Trophy 1st Rd Proper
Further to the email circulated to clubs on 15/12/15 below, this email serves to provide notice to clubs involved in postponed or replayed 1st Rd Proper match this week that, if a match is further postponed and is unable to be played this week, it MUST be rescheduled for either Monday 11 or Tuesday 12 January. Any match that is further postponed on Monday 11 or Tuesday 12 January MUST then be rescheduled for either Wednesday 13 or Thursday 14 January in order to provide every opportunity of it being played prior to the date of the 2nd Rd Proper on Saturday 16 January.
In the event that a 1st Rd Proper match is not played and completed by Thursday 14 January, then it MUST be played on Saturday 16 January which would mean the 2nd Rd Proper having to be played in week commencing Monday 18 January.
Finally, the FA would like to acknowledge the hard work and effort that is being put into making arrangements at short notice and hopefully co-operation will continue to ensure that matches can be played on the earliest available date, in order for the Competition to remain on track and prevent causing fixture congestion in the future.