RB Leipzig defender Josko Gvardiol could be moving to Chelsea in a year.
The highly-rated left-footed centre-back is one of the hottest properties in European football.
The likes of Manchester City and Tottenham have been linked to him in recent months.
However, The Daily Mail suggests that Chelsea are now at the front of the queue for his signature.
The source states that both clubs are discussing a £77 million deal that will be completed in the coming days.
Gvardiol will spend this season with Leipzig on loan, before moving to Chelsea.