Swiss fullback Ricardo Rodriguez is pushing to quit VfL Wolfsburg for Chelsea.
Wolfsburg chief Klas Allofs is desperate not to lose the left-back, but BILD says the Switzerland international is keen to leave for London.
Chelsea hope to do business for around €20 million.
Allofs is reluctant to keep hold of a player who wants to leave, but any deal is likely to run to the end of the transfer window.
Rodriguez, 23, has also been linked with Real Madrid this summer.