Cardiff City must abide by the January 31 transfer deadline as they attempt to bolster a "pretty sombre" dressing room.
The Welsh club are still coming to terms with the disappearance of the plane carrying Argentine striker Emiliano Sala on Monday.
Sala, who became Cardiff's record signing last week after agreeing to join from Ligue 1 side Nantes, was confirmed by French authorities as one of two people aboard a Piper Malibu that vanished en route to the Welsh capital.
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The search for the aircraft carried into a third day on Thursday but hopes of a positive outcome continue to recede.