Chelsea are in contact with Barcelona over their left-back, Alejandro Balde, according to Mundo Deportivo.
The Premier League have been following the teenager for almost 18 months.
With Barca looking to land Marcos Alonso from Chelsea, the Blues could demand Balde in return.
The 18-year-old made five appearances for Barcelona this season after joining their academy in 2011.
Balde has only two years left on his current contract with the Catalans.
And the potential arrival of Alonso threatens to restrict his minutes even further.