Spanish international Niguez joined the Blues on a season long loan deal ahead of the 2021/22 campaign after slipping down the pecking order in Madrid.
However, despite initial confidence over Chelsea opting to activate their €40m purchase clause on him in next summer, reports from La Razon claim they have already reject the proposal.
Niguez has endured an underwhelming start to life at Stamford Bridge with just 45 Premier League minutes to his name so far this season.
The report adds Thomas Tuchel has already made a contingency plan for next summer and the Blues could now potentially rival Atletico Madrid for Inter Milan contract rebel Marcelo Brozovic.
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