Fabrizio Romano has provided Chelsea transfer news as the summer transfer window is still open.
The Blues have already signed Christopher Nkunku and Nicolas Jackson this summer and have been linked with an interest in Robert Sánchez as well as Moises Caicedo.
According to Romano, the Blues have sent formal bid for Sánchez to Brighton and negotiations are ongoing.
The goalkeeper has already accepted the Blues as his destination for next season, while the Seagulls hope for the 25-year-old to leave this summer.
Romano added that the Blues and the Seagulls remain in talks over Moises Caicedo deal.