Chelsea are looking at alternative options to Napoli centre back Kalidou Koulibaly with the Italians unwilling to sell until they find a replacement.
Antonio Conte is still searching for reinforcements to his squad and is considering Sunderland's Lamine Kone as a back-up choice if he cannot secure a move for Koulibaly.
Meanwhile, Chelsea are aware that Everton will be talking to Romelu Lukaku's agent Mino Raiola regarding his contract situation this week.
The Toffees have made it clear they will not consider offers for the former Blues striker and want to offer Lukaku a new deal, although he is keen on returning to Stamford Bridge.