Thomas Tuchel is on the hunt for a new wing-back in January after Ben Chilwell was ruled out for the season following knee surgery, while Reece James suffered a hamstring tear which has seen him just return to the grass earlier this week.
Sergino Dest and Lucas Digne, who has now moved to Aston Villa, have both been options, however recalling Emerson Palmieri from Lyon is the preferred option.
But the French side, despite being offered £3 million in compensation, are reluctant to let him leave before the end of the season.
Chelsea have added another name to their list of possible left-back targets. Sosa, 24, has played 17 times this term which has seen him play in a variety of position, highlighting his versatility.
He has played at left-back and right-midfield this season, but predominantly in left-midfield, as per Transfermarkt – 15 out of his 17 appearances.