Chelsea will recall defender Aaron Anselmino from Boca Juniors in January.
The 19-year-old joined the Blues in a £15.6m deal in August but was immediately sent back on loan to the Argentine giants.
It remains unclear whether Anselmino could go on another loan move within Europe, including potentially to partner club Strasbourg in France, or if he will remain with Enzo Maresca's squad.
Maresca currently has several injuries in his back line, including Wesley Fofana and Benoit Badiashile.
However, Argentine Anselmino also missed the last five league games of Boca's season with a hamstring problem.