The Sun says Chelsea must pay at least £45million to win the race for Cucurella.
And they will also have to see off Manchester City and Tottenham to land the Spanish left-back.
Blues boss Thomas Tuchel, buoyed by the news that Todd Boehly's £4.25billion takeover of the club has cleared its final hurdle, is plotting a major overhaul of his defence.
Cucurella fits the bill after a standout first season in England following a £15.4million transfer from Spanish outfit Getafe. Tuchel is braced to lose left-back Marcos Alonso, who is keen to return to Spain.
Chelsea's other player to fill that slot is Ben Chilwell and he only returned to action last weekend following a major knee injury.
Source: Tribalfootball
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