Town have recalled keeper Adam Przybek from his loan spell with Concord Rangers.
The 20-year-old joined the Beachboys in December and made five appearances for the National League South side.
The Wales U21 international, whose only senior appearance for Town was in the Leasing.com Trophy at Peterborough last season, is contracted to the Blues until the end of the season with the club having an option for a further year.
Przybek's recall is likely to indicate that Harry Wright will be left out of the 22-man senior squad - which can change regularly throughout the duration of the January window - to facilitate the addition of loanee Josh Harrop.
Town are understood to be very close to the £2.5 million limit and leaving out Wright, who at 22 counts as a senior player, will give the Blues some wriggle room when it comes to making the addition.
Przybek, 20 and not a senior player, would therefore be the Blues' third-choice keeper.