The possibility was discussed during the summer, when sporting director Deco explored potential defensive additions, including Inter Milan's Alessandro Bastoni. However, Flick ultimately decided that another signing was unnecessary.
The situation has since changed, with Barcelona experiencing defensive problems and a series of injuries that have reduced the German coach's options.
The performances of the back line have raised concerns, particularly as some of the difficulties resemble those experienced during the previous campaign. Flick has also been forced to contend with recurring fitness problems, making it increasingly difficult to maintain consistency.
Andreas Christensen's availability is another consideration. The Danish international has been sidelined for more than a month, leaving Barcelona with fewer reliable alternatives in central defence.
Jules Kounde's ankle injury has added to the concerns, while other defensive absences have further complicated the coach's selection decisions.
The sporting department and coaching staff are therefore understood to be reconsidering whether the squad has sufficient depth to negotiate the second half of the season.
However, any January recruitment will depend on the opportunities available. The winter market traditionally offers fewer possibilities than the summer, with clubs reluctant to lose important players halfway through a campaign.
Barcelona would consequently need to decide whether to pursue an established defender capable of making an immediate contribution or a younger prospect who could develop into a longer-term solution.
The financial situation will also be crucial. The club's Financial Fair Play position will determine the extent of its spending power and whether a new arrival can be registered without further adjustments to the squad.
Alejandro Balde's situation could also become relevant. The left-back has been linked with a possible departure if his playing time does not improve, although no decision over his future has been confirmed.
A departure could create additional room within the squad and potentially help facilitate recruitment.
For now, Barcelona have not committed to signing another centre-back, but Flick's position has reportedly softened. The final decision will depend on the defensive situation, available transfer opportunities and the club's financial capacity.