Chelsea could reportedly battle Manchester United for the signature of Porto defender Eder Militao in January.
Portuguese newspaper A Bola (h/t Metro) reported Blues coach Maurizio Sarri has turned his attentions to the Brazilian youngster as he attempts to strengthen his defence.
The 20-year-old has seen his reputation explode at Porto and made his international debut in September.
Per A Bola, Militao has a €50 million (£44 million) release clause in his deal after arriving from Sao Paulo for just €4 million (£3.