Chelsea have made a cash plus player swap offer for Barcelona striker Pierre-Emerick Aubameyang.
Barca need to make player sales in order to register new signing Jules Kounde for the LaLiga.
Local reporter David Ornstein states Chelsea have submitted a £15m bid for Aubameyang, according to reports.
And the Blues have also thrown Marcos Alonso in to sweeten the deal.
However, Barca are yet to respond to Chelsea's offer, it was added.