Chelsea will have to make RB Leipzig centre-back Josko Gvardiol the most expensive defender in history if they are to sign the Croatia international in January, according to transfer expert Fabrizio Romano.
The 20-year-old, who turns 21 next month, had been strongly linked with a move to Stamford Bridge prior to the World Cup, however, his stock has appreciated in value after a handful of excellent displays in Qatar with Croatia finishing third.
Gvardiol played every single minute of Zlatko Dalic's side's campaign, scoring the opener in Croatia's 2-1 victory over Morocco in the third-place play-off after being blown away by eventual winners Argentina in the semi-finals.
