Sevilla fear Manchester United will meet Jules Kounde's buyout clause in January.
Sevilla knocked back a £42.5million offer from Chelsea for the Frenchman in the summer, demanding the Blues met their £69m asking price.
They are now worried they could lose Kounde in the upcoming transfer window but it is Chelsea's Premier League rivals United who are causing the concern.
AS says United could swoop in to beat Chelsea to Kounde's signature as they look to solve their own problems in defence.
Summer signing Raphael Varane's start to life at Old Trafford has been blighted by injury, while Harry Maguire's struggles have continued.
According to the report, United, who currently sit sixth after four defeats, are monitoring the defender and could meet Sevilla's demands.
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